Question

if sum of 'n' terms of an A. P is 3n²+5n and nth term is 164, then n =?​

Answer 1

Answer:We will subtract sum of n+1

Th term from sum of nth term to get 164

Step-by-step explanation:

3(n+1)^2+5(n+1)-3n^2-5n=164

6n+6=164

6n=158

N=158/6

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