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Question

If four coins are tossed, find the chance that there should be two heads and two tails.

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Solution

Coin is tossed four times
So total number of outcomes =24=16
Number of ways of getting two heads =4C2=4!(42)!2!=4!2!2!=6
Now number of ways of getting two tails =2C2=1
required probability =616=38

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