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  4. The value of sum displaystyle∑k=1∞(2 k-1)((9/11))k is equal to

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Q. The value of sum $\displaystyle\sum_{k=1}^{\infty}(2 k-1)\left(\frac{9}{11}\right)^k$ is equal to

Sequences and Series

Solution:

Correct answer is (a) 45Correct answer is (c) sum of first nine natural numbers.