I was just watching ’ Expecting - Get a Head ’ lecture.
In that in the instructor made a recursive function :
x = (1)(1/2) + (1+x)(1/2)
x = no. of throws
Why we have taken ’ x+1 ’ instead of ’ x-1 ’ because according to me, if the outcome of the toss, came tails, then we have left only ’ x-1 ’ throws.
@siddharth_1_3277,
x is not total number of throws, it is expected no. of throws to get a head, so if we get a rail in current throw, then it means that this throw was wasted, and expected throws will now be
x(required to get head) + 1(wasted now to get tail).
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