Question

if two coins are tossed together, what are the chances of getting “head head"

Answer 1

When two coins are tossed the sample space is

{HH,HT,TH,TT} where H and T denotes heads and tails respectively.

So we have 4 outcomes. Knowing there is at least one heads coming up the sample space reduces to {HH,HT,TH} i.e. 3 outcomes.

So the probability of getting two heads is 1/3.

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Answer 2

{HH, HT, TH, TT} are the possible events

for HH

probability is 1/4