Edmund's Brainteasers
Problem 19
Problem 19: Even hymns
Our hymnbook contains 542 hymns. The numbers divisible by 2 are 2, 4, 6, 8, ... and the numbers divisible by 3 are 3, 6, 9, 12, 15, .... How many hymn numbers are not divisible by 2 or by 3?
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