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JEE MAIN_2022
26-07-2022_S1
Question
Consider two G.Ps. $2,2^2, 2^3$, ann and $4,4^2, 4^3$ of 60 and $n$ terms respectively. If the geometric mean of all the $60+n$ terms is $(2)^{\frac{225}{8}}$, then $\sum_{k=1}^n k(n-k)$ is equal to .
Select the correct option:
A
560
B
1540
C
1330
D
2600
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Solution not available
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