Let denote the total number of triangles formed by joining the vertices of an n-side regular polygon. If , then the sum of all distinct prime divisors of n is :
- (A)7
- (B)8
- (C)5✓ Correct
- (D)6
Answer: (C)
Solution
The number of triangles from an -gon is , and . Setting gives , so . Its distinct prime divisors and sum to .
JEE Main · 2026 · 02 Apr 2026 · Shift 2 · Single correct option