Two unbiased coins are tossed. What is probability of getting at most one tail ? Answers.
A) 1/2  B) 1/3  C) 3/2  D) 3/4  E) None of these
Explanation:   Total 4 cases = [HH, TT, TH, HT]   Favourable cases = [HH, TH, HT]   Please note we need atmost one tail, not atleast one tail.   So probability = 3/4   Option 3/4
<result>D</result>
Two unbiased coins are tossed. What is probability of getting at most one tail ?