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

You are not logged in.

- Topics: Active | Unanswered

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,666

Hi fatty;

It is not wise to just go handing your email address out like that. The asker here might be legitimate but anyone on the internet can see it also. You are leaving yourself open to spammers and hackers as well as numerous bots.

You might have been unaware of that. If you put it back I will assume you are willing to chance it and I will not interfere further.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

Offline

**maria tan****Guest**

The product of two number is 32 and thier quotient is 8.find the number.

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,666

Hi maria tan;

The two numbers are 16 and 2.

There are only 3 products that equal 32. 8 x 4 = 32, 2 x16 = 32 and 1 x 32 = 32. Only one of them has a quotient of 8. Welcome to the forum.

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

Offline

**Umar****Guest**

lfjsdjk wrote:

mathsyperson wrote:Presumably it wants you to find 1x2x3x4x5x6x7x8x9x10x11x12x13x14x15, also known as "15!".

it actually doesn't equall fifteen it equals 3026144400. becuase you have to find out what 1*2 is and the product of that *3 and the product of that #4 and the product of that *5 and keep going until you get to the product of 15.

15! means 15 facturo or something like that which is basically the product of 15

:D:D:D:D:lol::lol:

**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,523

15! is not the product of 15, it is the product of all natural numbers less than 15. Maybe that is what you meant?

Here lies the reader who will never open this book. He is forever dead.

Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 86,666

Hi Umar;

Welcome to the forum. You are correct in drawing attention to the miscalculation.

15! = 1307674368000 not 3026144400

**In mathematics, you don't understand things. You just get used to them.Of course that result can be rigorously obtained, but who cares?Combinatorics is Algebra and Algebra is Combinatorics.**

Offline

**noelevans****Member**- Registered: 2012-07-20
- Posts: 236

Hi rstakits!

Using N for "a number" that would be 800 times N, or 800N or 800xN where x means times.

If you have a collection of numbers like {3,10,5} then X{3,10,5}=1x3x10x5=150 would be the

product of the numbers in the collection. We in essence "scale up" the 1 by the numbers in the

set. If there are no numbers in the set like the set { } then we don't have anything to scale the

1 up by so we just get the 1. X{ }=1.

So this gives us a short notation for multiplying any collection of numbers we want. If all the

numbers in the set are the SAME then we have exponentiation. X{2,2,2}=1x2x2x2=2^3, which

is called "two cubed."

That may be more than you wanted, but maybe it will help somewhere along the line.

Have a stupendous day!

Writing "pretty" math (two dimensional) is easier to read and grasp than LaTex (one dimensional).

LaTex is like painting on many strips of paper and then stacking them to see what picture they make.

Offline

**noelevans****Member**- Registered: 2012-07-20
- Posts: 236

Hi bobbym!

Finally! Patience works. I now have a signature. I'll probably change it to something else before

long since I just put something in the "slot" to see when it would finally appear.

Have a lovely day!

Writing "pretty" math (two dimensional) is easier to read and grasp than LaTex (one dimensional).

LaTex is like painting on many strips of paper and then stacking them to see what picture they make.

Offline