Property 3. (Mean of the composite series ). If xi (i = 1, 2,..., k ) are the means of k component series of sizes n¡ , ( i =1, 2,...., k ) respectively, then the mean x of the composik series obtained on combining the component series is given by the formula : k 111 x1 +12 X2+ n, + N2 + ... + nk ... N¡ X¡ i=1 Ni i=1 %3D

Q: what does Hhe NTTFD lell you about the followng series : n

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A: We have to find the sum of the series

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A: I think 3rd no series is not  written properly.  Solutions for others two,

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A: A detailed solution is given below

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A: In this question, we have to find n for given |Rn|<0.0001.

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A: Identify the two series that are the same

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