A sequence of 120 natural numbers is given such that number n is written n times {1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5,…}

By Iris

A sequence of 120 natural numbers is given such that number n is written n times {1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5,…}. Determine how many numbers is divisible by 5.

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