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what is the probability that the sum of the numbers will be

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by 4meonly » Sun Aug 24, 2008 10:34 pm
Two boxes each contain three balls, numbered with 1, 2, 3. If one ball is to be selected from each box, what is the probability that the sum of the numbers will be even?
a. 1/9
b. 2/9
c. 4/9
d. 5/9
e. 1

OA is D
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Re: what is the probability that the sum of the numbers will

by sudhir3127 » Sun Aug 24, 2008 11:05 pm
4meonly wrote:Two boxes each contain three balls, numbered with 1, 2, 3. If one ball is to be selected from each box, what is the probability that the sum of the numbers will be even?
a. 1/9
b. 2/9
c. 4/9
d. 5/9
e. 1

OA is D
I go with D

sum will be even if

both are even or both are odd

probability of drawing a even number is 1/3( from 1,2,3) and an odd is 2/3

so its

1/3*1/3 + 2/3*2/3
1/9 + 4/9 = 5/9

hope that helps..
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