Question

Josh is going to choose a two digit number. What is the probability that the sum of the digits will be nine?

Answer 1

The answer is 4/45 I believe so

Answer 2

4/45

Explanation:

First find all the pairs that make 9 that are two digit:

1+8

2+7

3+6

4+5

5+4

3+6

2+7

1+8

That's 8 pairs, and as there are 90 two digit numbers, 8/90 is the answer. but if you want to simplify, the answer is 4/45