The answer depends on whether the children are picked at random. If they were selected from inside a girls' school the probability should be quite close to 0. Likewise, if the children were picked inside a boys' school.
If six children are picked at random from a large group of children with an equal number of boys and girls, then the answer is
6C2*(1/2)6 = 15/32 = 0.47, approx.
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In a family with four children, the probability of having four boys is 1 in 16.
1/8
4/16 or 0.2 or 25%
50/50
50%