Question

find the probability of
getting at least one head when two coins are tossed at a

Answer 1

Possible combinations:
HH
HT
TT
TH

Therefore, probability = 3/4

Answer 2

There are four equally-probable possible two-coin tosses, HH, HT, TH, TT, But we know one coin isheads, so that eliminates the TT possibility, leaving HH, HT, and TH.Two of those possibilities have exactlyone head, so the answer is 2/3.