An unbiased coin is tossed repeatedly and outcomes are recorded. What is the expected no of toss to get HT ( one head and one tail consecutively)?
My approach-- e=expected number of tosses e=[if first tail comes] + [if first is head and second is head] + [required probability of first head and second tail] e= 1/2(e+1) + 1/4(e+2) + 1/4
is it correct?