Question

A bag contains 26 letters and 10 numerals. Robin draws two cards from the bag. What is the probability that she draws 2 numerals?

Answer 1

I believe it is 15. You add up 26 and 10 to get the total amount of objects. You then divide by how many you are trying to pull out.

Answer 2

On the first draw, there are 10 numerals out of 36 cards.
P(first card is a number) = 10/36 = 5/18

On the second draw, there are 9 numerals out of 35 cards.
P(second card is a number) = 9/35

The probability of both events is the product:
P(both cards are numbers) = P(first card is a number) x P(second card is a number)
= 5/18 x 9/35
= 1/2 x 1/7 (cancel a 5 and a 9).
= 1/14