dice questions

I have these two questions and just want to make sure they are right:

5.6 Determine the probability of the following:

a. If three dice are rolled, that all will be odd = 1/2

b. If two coins are flipped, that they both will land the same = 1/2

Can someone please tell me if this is correct. Thanks.

Quote:

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Originally Posted by papa_chango123

I have these two questions and just want to make sure they are right:

5.6 Determine the probability of the following:

a. If three dice are rolled, that all will be odd = 1/2

b. If two coins are flipped, that they both will land the same = 1/2

Can someone please tell me if this is correct. Thanks.

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You are incorrect in both.


a. If three dice are rolled, that all will be odd

There is 1/2 chance that one die will land odd.

So for three dice its:

So it's only a 1/8 chance :eek:

Now you try the coins

Ok I understand how you got the dice but on the coins here is my logic:

The coins flipped could be 4 probable:

HH, HT, TT, TH

So they could both land the same 2 times out of 4. Would that not be

2/4 = 1/2?

Quote:

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Originally Posted by papa_chango123

Ok I understand how you got the dice but on the coins here is my logic:

The coins flipped could be 4 probable:

HH, HT, TT, TH

So they could both land the same 2 times out of 4. Would that not be

2/4 = 1/2?

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Yes it would be :o (I tend to misread questions)

Just for you to think of it mathwise:

Whatever the first coin lands on will work, but the other coin has only 1/2 chance of landing the same way.

In math thats:

Thanks for the help