If the sum of first n terms of an A.P. is 4n – n.

If the sum of first n terms of an A.P. is 4n – n², what is the first term (i. e. S₁)? What is the sum of the first two terms? What is the second term? Also, find the 3rd term, the 10th term, and the nth terms.

Solution:

If S_n denotes the sum of first n terms of an A.P., prove that S₃₀ = 3(S₂₀ – S₁₀).

Solution:

More Solutions:

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