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(3) Let X be the poset of positive integers whose only prime divisors are 2, 3 and 5, with divisibility as the relation. (For

(3) Let X be the poset of positive integers whose only prime divisors are 2, 3 and 5, with divisibility as the relation. (For example 60 8100 in this poset.) Find the Mbius function for this poset and describe how to calculate (m, n) as simply as possible.

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