Question

In an ap if the sum of first n terms is 3n square +5n .....nd it's kth term is 164 ....then find the value of k... Pls help me out its urgent....

Answer 1

Answer:

27

Step-by-step explanation:

nth term = sum of n terms - sum of (n-1) terms

so by using the given statement

164 = 3k^2+5k - [ 3(k-1)^2+ 5(k-1)]

by solving this equation you get

6k+2 = 164

==> k = 27

hope this helps

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