POTW#13 - Happy Winter Break

Have a safe break everyone. Now see if you can crack this question (see what I did there?)

Ritchie's birthday landed on a Thursday this year. He asks people at random if they have two children and also if one is a boy born on a Thursday. After a long search he finally finds someone who answers yes. What is the probability that this person's two children are both boys? Assume an equal chance of giving birth to either sex and an equal chance to giving birth on any day of the week.

POTW #12 - Elf Race

Below is the solution for last week's Gauss Math Problem of the Week (#11). It was a TRICKY one!



Below is the Math POTW #12! Good luck!