Question 44
The first and last terms of an arithmetic progression are 25 and -52. What is the sum of the series if it has 12 terms?
Solution
In an arithmetic progression with first term, $$a = 25$$ , last term, $$l = -52$$
Number of terms = $$n = 12$$
$$\therefore$$ Sum of A.P. = $$\frac{n}{2} (a + l)$$
= $$\frac{12}{2} (25 - 52)$$
= $$6 \times (-27) = -162$$
=> Ans - (A)
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