Problem: Ms. Ashol has 20 boys and 16 girls in her mathematics class. If she chooses two students at random to work on the blackboard, what is the probability that both students chosen are girls?

Question

What I did : I added the boys and girls 36

(16c2)/(36c16)

Answer 1

Yes 36
first girl
16/36
second girl
15/35
so
16/36 * 15/35

Answer 2

I’m confused why it was 15/36 for the second girl though wouldn’t it be 15/35

Answer 3

Yes, I said
first 16/36
second 15/35