## Odd Product

#### Problem

It can be seen that the product of the digits in 38, 3 8 = 24, is even and the product of the digits in 57, 5 7 = 35, is odd.

How many 2-digit numbers have an odd product?

Problem ID: 61 (Jan 2002) Difficulty: 1 Star

It can be seen that the product of the digits in 38, 3 8 = 24, is even and the product of the digits in 57, 5 7 = 35, is odd.

How many 2-digit numbers have an odd product?

Problem ID: 61 (Jan 2002) Difficulty: 1 Star