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What is the correct answer?

4

Two unbiased coins are tossed. What is probability of getting at most one tail ?

A. 12

B. 13

C. 32

D. 34

Correct Answer :

D. 34



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 = 34