Question

A couple are planning to have four children. (Assume that it is equally likely for a boy or a girl to be born.)

What is the probability that all four of their children will be girls?
What is the probability that at least one will be a girl?
What is the probability that all four will be of the same sex?
What is the probability that not all four will be of the same sex?

Answer 1

1/4

Step-by-step explanation:

The denominator is four because it represents the four possibilities about what gender the babies will be. The numerator is 1 because there is one chance out of four that (insert gender ratio) will be picked.

Examples:

There is one chance out of four chances that all four of the children will be girls.

There is one chance out of four chances that at least one child will be a girl.

There is one chance out of four chances that all four will be of the same sex.

There is one chance out of four chances that not all four will be of the same sex.