# Solving series 1,3,6,10… using recursion

How would you solve 1,3,6 and 10 using the recursive and explicit formulas?

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JavaScript code below. It uses, first number , difference between first 2 numbers and number of elements to print as inputs, to output the series.

// self executing function (function() { print_series (1, 2, 10); /* input params, first number, diff between first 2 elements and number of elements to print */ })(); /* algorithm which prints the series recursively */ function print_series (first_num, first_diff, num_elements) { // prints series 1 3 6 10... recursively var curr_num = first_num; if (0 === num_elements) return curr_num; console.log(first_num); return print_series(curr_num + first_diff, first_diff + 1, num_elements - 1); }

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