Two coins are simultaneously tossed until one of them comes up a head and the other a tail. The first coin comes up a head with probability p and second with probability q. All tosses are assumed independent.
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Total out comes=4 (HT,TH,HH,TT)
P OF GETTING Head =1/2
P of getting tail =1/2
P of getting one tail and one head=2/4=1/2
P of first coin come up with a head=1/2
P of second coin come up with head=1/2
P OF GETTING Head =1/2
P of getting tail =1/2
P of getting one tail and one head=2/4=1/2
P of first coin come up with a head=1/2
P of second coin come up with head=1/2
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