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'Inclusion Exclusion' printed from https://nrich.maths.org/
How many integers between 1 and 1200 are multiples of 2?
How many integers between 1 and 1200 are multiples of 3?
How many integers between 1 and 1200 are multiples of 5?
Some integers are multiples of both 2 and 3, of both 2 and 5, of
both 3 and 5...
Some integers are multiples of 2, 3 and 5...
Can the Venn diagram in the question help, if you consider that the
multiples of 2, 3 and 5 each correspond to one of the sets
(circles)?