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by shashank.ism » Sat Feb 20, 2010 1:09 pm
When two unbiased dice are tossed simultaneously, the numbers that appear on the top surface of the two dice are 'a' and 'b'.What is the probability that (a × b) is a perfect square?

A) 5/26
B)1/3
C) 7/36
D) 1/6
E) 2/9

CA is E
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by ajith » Sat Feb 20, 2010 1:20 pm
shashank.ism wrote:When two unbiased dice are tossed simultaneously, the numbers that appear on the top surface of the two dice are 'a' and 'b'.What is the probability that (a × b) is a perfect square?

A) 5/26
B)1/3
C) 7/36
D) 1/6
E) 2/9

CA is E
There are 36 possible outcomes

1,1
2,2
..
6,6

are six favourable outcomes

(1,4) (4,1) are another 2

so total favourable outcomes =8

Probability = 8/36 = 2/9
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