Question 847209
We can assume that the event of having a boy has no impact on the next child being a boy or girl. (you can almost think of it as flipping a coin: heads is boy, tails is girl. Me getting heads last time doesn't make it any more likely the next flip).  The term we use for this is independent.

P[no girl] = P[boy] = 0.5

P[5 boys] = P[boy]^5 = 0.5^5 = 0.0313