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

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.

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