Question

Every time Tom and Maya have a child, there is an equal probability of it being a boy or a girl.

Answer 1

All outcomes of three children (using G for girl and B for boy)
GGG, GGB,GBG,GBB,BGG,BGB,BBG,BBB
1) exactly two is 3 out of 8 total outcomes, or 3/8
2)  all sons is one outcome, or 1/8