If the sum of n terms of an A.P. is 3n^2 + 5n and its m^{th} termi | Filo
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Class 10

Math

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Sequences and Series

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If the sum of terms of an A.P. is and its term
is find the value of

Solution:

Taking we get









Taking we get









Taking we get









So,



Now, we have to find the value of  











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