Aptitude - Question 10

+3 votes
If two fair coins are tossed and at least one of the result is known to be a tails, 
what is the probability that both outcomes are tails?

(A) 1/3 
(B) 1/4
(C) 1/2
(D) 2/3
asked May 10 in Aptitude by getgatebook (25,660 points)
reshown May 11 by getgatebook

1 Answer

+4 votes
two fair coin when tossed  sample space is

H H

H T

T H

T T

one is know to be tail we have three such cases

both will be tail is TT one out of 3

1/3 answer
answered May 11 by tsankitjha910 (3,450 points)
Answer:
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