A polygon has 77 diagonals. Then what is the number of sides of the same polygon

A polygon has 77 diagonals. Then what is the number of sides of the same polygon

A polygon has 77 diagonals. Then what is the number of sides of the same polygon?

(a)          11

(b)          15

(c)           14

(d)          16

Sol:

quantitative aptitude
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