Mr. and Mrs. X stays in a house along with their 7
children. The female to male ratio in the family is 1:2.
A person is

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1. Answer:

   Probability = 0

   Step-by-step explanation:

   There are total 9 members in the family.

   7 children + Mr. Gulati + Mrs. Gulati. = 9

   As the sex ratio is female:male = 1:2

   Total number of male in the family = X

   ∴ Female in the family = 2X

   ∴ X + 2X = 9

   ∴ X = 3

   One male and one female in the family are Mr. and Mrs. Gulati.

   ∴ Male children = 3 – 1 = 2

   Female children = 6 – 1 = 5

   From above, the sex of the children is 2 male and 5 female.

   This prooves that, same sex children are not possible for given children.

   ∴ Probability that all the children are of same sex is zero.

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