Sum: a recursive function that computes the sum of integers 1, 2, 3, …., n for a given number n. So Sum(6) should return 1 + 2 + 3 + 4 + 5 + 6 , i.e. 21. sum(n) = n + sum(n-1)

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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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2. Sum: a recursive function that computes the sum of integers 1, 2, 3, …., n for a given number n.


So Sum(6) should return 1 + 2 + 3 + 4 + 5 + 6 , i.e. 21.
sum(n) = n + sum(n-1)

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