Let a, ar,... | Sequences and Series | JEE Main 2024

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JEE Main 2024

09-04-2024 S2

Question

Let a, ar, $a r^{2^2} \ldots \ldots .$. be an infinite G.P. If $\sum_{n=0}^{\infty} a^n=57$ and $\sum_{n=0}^{\infty} a^3 r^{3 n}=9747$, then a $+18 r$ is equal to :

Select the correct option:

A

27

B

36

C

48

D

31

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

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