Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**Mathegocart****Member**- Registered: 2012-04-29
- Posts: 1,869

1.How many unique sets of 4 prime numbers exist for which the sum of the members of the set is 45 ?

2. Bobbym wrote on a gigantic piece of paper all the numbers from 1 to 9999 . How many zero digits did he have to write down?

3. Find

.

4. Find x.

5. Which is greater?

[edited by admin](he latexed my post, gratitude to BOBBYM.

6. Find the sum of all perfect squares that divide 2016.

7. Find the greatest possible value of pq + r, where p, q, and r are (not necessarily distinct) prime numbers

satisfying pq + qr + rp = 2016.

8. Positive integers m and n are both greater than 50, have a least common multiple equal to 480, and have a

greatest common divisor equal to 12. Find m + n.

9. Bobbym is stuck fighting his nefarious lizard neighbors yet again though he has another weapon in his math... A LASER! He has 15 health, and the lizard has 20 health. He can deal any integer amount of damage from 1 to 4 and he has a 1/5 chance of dealing 3 damage, a 1/2 chance of dealing 1 damage, and a 1/5 chance of dealing 2 damage, and a 1/10 chance of deleaing 4 damage. Calculate the probability that bobbym will make it out alive, given that bobbym strikes first. The lizards have a 50% chance of dealing 1 damage, and a 50% chance of dealing 2 damage.

10. Find all continuous functions such that

and

*Last edited by Mathegocart (2016-08-30 04:45:39)*

The integral of hope is reality.

Offline

I think you're missing some information in #5.

**LearnMathsFree: Videos on various topics.New: Integration Problem | Adding FractionsPopular: Continued Fractions | Metric Spaces | Duality**

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Mathegocart****Member**- Registered: 2012-04-29
- Posts: 1,869

Fixed.(5)

The integral of hope is reality.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Are you sure?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Mathegocart****Member**- Registered: 2012-04-29
- Posts: 1,869

bobbym wrote:

Hi;

Everything is correct, and I have fixed problem number 5.(VERIFIED.)

*Last edited by Mathegocart (2016-08-28 11:18:46)*

The integral of hope is reality.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Number 5 is rather easy, are you sure that is what you want? I need more for 9.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Mathegocart****Member**- Registered: 2012-04-29
- Posts: 1,869

I meant .

The integral of hope is reality.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Number 9 requires more information. What happens at the endpoints and what kind of damage does the large lizard do?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Mathegocart****Member**- Registered: 2012-04-29
- Posts: 1,869

bobbym wrote:

Number 9 requires more information. What happens at the endpoints and what kind of damage does the large lizard do?

Didn

't I already specify what kind of damage he does? And how much damage you deal?

The integral of hope is reality.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Sorry, yes you did.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Mathegocart****Member**- Registered: 2012-04-29
- Posts: 1,869

bobbym wrote:

Sorry, yes you did.

I just wanted to verify.

The integral of hope is reality.

Offline

**thickhead****Member**- Registered: 2016-04-16
- Posts: 1,077

*Last edited by thickhead (2016-08-28 19:54:32)*

**{1}Vasudhaiva Kutumakam.{The whole Universe is a family.}(2)Yatra naaryasthu poojyanthe Ramanthe tatra Devataha{Gods rejoice at those places where ladies are respected.}**

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi Mathegocart;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**thickhead****Member**- Registered: 2016-04-16
- Posts: 1,077

**{1}Vasudhaiva Kutumakam.{The whole Universe is a family.}(2)Yatra naaryasthu poojyanthe Ramanthe tatra Devataha{Gods rejoice at those places where ladies are respected.}**

Offline

**Mathegocart****Member**- Registered: 2012-04-29
- Posts: 1,869

bobbym wrote:

Hi Mathegocart;

The battle is, indeed, described in this manner.

The integral of hope is reality.

Offline

**Mathegocart****Member**- Registered: 2012-04-29
- Posts: 1,869

thickhead wrote:

Wait, what? One of his acquaintances is named Liz?

The integral of hope is reality.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Not that I know of.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**thickhead****Member**- Registered: 2016-04-16
- Posts: 1,077

(2)

No.of 0's in unit place=9999 div 10=999

No. of 0's in tens place=10*(9999 div 100)=990

No. of 0s in hundred place=100*(9999 div 1000)=900 Total=2889

No of any other digit=( 9999 div 10+1)+10*(9999 div 100+1)+100*(9999 div 1000+1)+1000*(9999 div 10000+1)=4000

**{1}Vasudhaiva Kutumakam.{The whole Universe is a family.}(2)Yatra naaryasthu poojyanthe Ramanthe tatra Devataha{Gods rejoice at those places where ladies are respected.}**

Offline

**Mathegocart****Member**- Registered: 2012-04-29
- Posts: 1,869

thickhead wrote:

(2)

No.of 0's in unit place=9999 div 10=999

No. of 0's in tens place=10*(9999 div 100)=990

No. of 0s in hundred place=100*(9999 div 1000)=900 Total=2889

No of any other digit=( 9999 div 10+1)+10*(9999 div 100+1)+100*(9999 div 1000+1)+1000*(9999 div 10000+1)=4000

Strange, because with casework, I have gotten the same solution as bobbym has. I will check if I made a naive mistake, but..

The integral of hope is reality.

Offline

**thickhead****Member**- Registered: 2016-04-16
- Posts: 1,077

My solution is same as bobbym's. Only i have added result for any digit other than 0.

(2)Yatra naaryasthu poojyanthe Ramanthe tatra Devataha

{Gods rejoice at those places where ladies are respected.}

Offline

Pages: **1**