Question

. two unbiased coins are tossed simultaneously. find the probability of getting: (a) at least one head (b) two heads (c) one head (d) at most one head

Answer 1

a)3/8
b)1/4
c)5/8
I hope this will help you in your doubt

Answer 2

The combinations that can be possible for 2 coins are
HH, HT, TH, TT
Hence possible chances for a) at least one head = 3
Total no of chances = 4 hence probability =3/4
b) total chances of 2 heads = 1
Hence probability = 1/4
c) total chances of one head = 2
Hence probability = 2/4
d) chances of utmost 1 head = 2
Hence probability = 2/4