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m22 #8

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m22 #8 [#permalink] New post 09 May 2010, 12:05
What is the probability that one of the two integers randomly selected from range 20-29 is prime and the other is a multiple of 3?

(The numbers are selected independently of each other, i.e. they can be equal)
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Re: m22 #8 [#permalink] New post 11 May 2010, 21:21
Prime number in the range 20 - 29 is 23 only.
Multiples of 3 in this range are - 21 , 24 , 27

Probability = 1/10 ( Probability of getting 1 Prime no. out of total 10 numbers ) * 3/9 ( Probability of getting multiple of 3 out of remaining 9)

= 3/90 = 1/30.

Hope its correct..
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Re: m22 #8 [#permalink] New post 13 May 2010, 07:22
LM wrote:
What is the probability that one of the two integers randomly selected from range 20-29 is prime and the other is a multiple of 3?

(The numbers are selected independently of each other, i.e. they can be equal)


There are two primes within the 20-29 range = 23 and 29. So P=2/10
There are three numbers that are multiple of 3: 21, 24 and 27. So P=3/10

So to have one AND the other (2/10)*(3/10) = 3/50

What is the OA ?

Thanks,
Re: m22 #8   [#permalink] 13 May 2010, 07:22
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m22 #8

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