91Ó°ÊÓ

Sample space of any experiment is the set of all possible mutually exclusive events.Sample space can be uniform or non-uniform, it depends on the probability of each event in the sample space.

A child being a girl or a boy does not depend on whether the previous child was a girl or a boy.

Let G represents girl child and B represents Boy child, so, the possible outcomes for two children are 4 that are as follows,

$\left(BB , BG , GB , GG\right)$

When one child is a girl, this makes out of the events and the sample space becomes $\left(BG , GB , GG\right)$and each has a probability of $\frac{1}{3}$, this implies that the probability of other child being a girls is$\frac{1}{3}$ when the other child is also a girl.

Thus, the given argument is incorrect.