Question

Ten slips of paper labeled from 1 to 10 are placed in a hat. The first slip of paper is not replaced before selecting the second slip of paper.

What is the probability of selecting an odd number followed by an even number?

A. 1/4
B. 1/5
C. 5/18
D. 2/9

Answer 1

5/10 * 5/9
1/2 * 5/9
5/18

Answer 2

Note: Since the question states that the first number is not replaced, the second number is "dependent" on the first.

Problem Solved:

Probability (odd, then even) = (5/10) x (5/9)
(5/10) x (5/9)
= 25/90
= 5/18 (simplified)

Answer: C. 5/18