Question 53

Let $$n_1 < n_2 < n_3 < n_4 < n_5$$ be positive integers such that $$n_1 + n_2 + n_3 + n_4 + n_5 = 20.$$ Then the number of such distinct arrangements $$(n_1, n_2, n_3, n_4, n_5)$$ is

Correct Answer: 7

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