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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?
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