contest R2 Q4
https://minihotelier.com/blog/2016/05/07/contest-r2-q4-2/Aptitude
100 identical coins each with probability P of showing up Heads are tossed once. If 0 < P < 1 and the probability of Heads showing on 50 coins is equal to that of Heads showing on 51 coins, then value of P is:
a) 1/21
b) 49/101
c) 50/101
d) 51/101
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