The first and last terms of an arithmetic progression are -23 and 42. What is the sum of the series if it has 14 terms?
In an arithmetic progression with first term, $$a = -23$$ , last term, $$l = 42$$
Number of terms = $$n = 14$$
$$\therefore$$ Sum of A.P. = $$\frac{n}{2} (a + l)$$
= $$\frac{14}{2} (-23 + 42)$$
= $$7 \times 19 = 133$$
=> Ans - (B)
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