Two unbiased coins are tossed.what is the probability of getting at one tail A)1/2 B)1/3 C)2/3 D)3/4 E)none of the above answers is correct?

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