Math Is Fun Forum

juantheron

Member

Registered: 2011-10-19

Posts: 312

8 digit no

If the eight digits 1, 2, 3, 4, 5, 6, 7, 8 are randomly permuted, what is the probability that the resulting eight-digit number is divisible by 8

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 8 digit no

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.

juantheron

Member

Registered: 2011-10-19

Posts: 312

Re: 8 digit no

thank bobbym

how can you get this

i have understand like that

if a no. is divisable by 8 then it has a factor 4.2

means no. is even and last two digit are divisable by 4

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 8 digit no

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.

jonny

Guest

Re: 8 digit no

thank bobbym got it

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 8 digit no

Hi Juan;

You are welcome but I think it is a little cumbersome, will post if I find something better.

---

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.