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Question

Twenty identical coins each with probability p of showing heads are tossed. If the probability of heads showing on 10 coins is same as that of tails showing on 11 coins, then p is
  1. 12
  2. 1021
  3. 1121
  4. 1321

A
1121
B
1321
C
12
D
1021
Solution
Verified by Toppr

The probability of heads showing on 10 coins =10p
The probability of tails showing on 11 coins =11(1p)
according to question both are same => 10p=11(1p)
=> p=1121

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