A disease is inherited by a child with a probability of

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A disease is inherited by a child with a probability of 1 .
4

In a family with two children, the probability that exactly one sibling is affected by this disease is

1. 1
  4
2. 3
  8
3. 7
  16
4. 9
  16

Correct Option: B

Given : P(E) =	1	, P(E) =	3
	4		4

P(x = 1) = 2C₁ ×		1		×		3		=	3
		4				4			8