-1, 1/4, 3/2, …… ;10 terms.

Question

Find the sum of indicated number of terms in the following A.P.

-1, 1/4, 3/2, …… ;10 terms.

Answer 1

Given: -1, \(\frac{1}{4}\), \(\frac{3}{2}\), …… ;S₁₀.

a = – 1

d = t₂ – t₁ = \(\frac{1}{4}\) – (-1)  = 1 + \(\frac{1}{4}\) = \(\frac{5}{4}\)