Math Is Fun Forum

coolguy29

Member

Registered: 2012-05-17

Posts: 1

Probability

A six sided die is rolled twice. One of the rolls gives 4. What is the probability that the other one will give 5.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Probability

Hi coolguy;

Tricky wording. I say 1 / 18 my brother says 1 / 6.

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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.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,648

Re: Probability

hi bobbym,

How are you today?  And what about your brother?

That wording isn't tricky to me.  We're only asked about the second roll.

Bob

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Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Probability

Hi Bob;

I am okay, How are you?

That is what my brother thinks too. I thought of it in terms of the sample space. There are 36 possible throws, 2 of them fit the conditions, (4,5) and (5,4). 2 / 36 = 1 / 18.

But now it is 2 to1 against that idea! I can not remember the last time I got a probability problem wrong so...

My brother asked to me point out that the last error was yesterday, a mere 5 hours ago.

Against my wishes my parents had to have more children.

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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.