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B
18
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C
116
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D
132
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Solution
The correct option is C116 Probability of a son for the first time to a couple is 1/2 as probability of a daughter is 1/2. Similarly, the probability of a son for the next 3 times will be 1/2 each time. Hence, the probability of 4 sons to a couple is 1/2 x 1/2 x 1/2 x 1/2 = 1/16.