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 NCERT EXERCISE 9.2

Question 13. If the sum of n terms of an A.P. is $$3n^2+5n$$ and its mth term is 164, find the value of m.

Question 14. Insert five numbers between 8 and 26 such that the resulting sequence is an A.P.

Question 15. If $$\frac{a^n+b^n}{a^{n-1}+b^{n-1}}$$ is the A.M. between a and b, then find the value of n.