Spero21 :
It does not feel correct because it is not correct. If I am wrong, please respond to the math. The problem is not like two coins. Children are born in order, not simultaneously. Child M is male. Child M could be the older child or the younger child. This means MX or XM, both with a 50% probability. In the choice is MX, there is a 50% chance that X is male, and 50% for female, so Mm or Mf. In the choice of Xm, the probability that X is male, mM, is 50%, and 50% for female, fM. So if one child is Male, the set of outcomes is: Mm, mM, Mf, fM.
2026-10-25 01:17:24