SSC Selection Post 2024 PYQ — Question 52

The correct answer is Option 1 i.e. 9840.

S = $3+3^2+3^3+................+3^8$

S_n = a × $r^n - 1 \over r-1$

⇒ S = 3 × $3^8 - 1 \over 3-1$ = 3 × $6561 - 1 \over 2$ = 3 × 3280 = 9840