Question

If 18, a, b, -3 are in A.P, then a + b = *
19
15
7

Answer 1

Step-by-step explanation:

A) - 12(B) - 16(C) - 18(D) - 21If the sum of the first 11 terms of an arithmetical progression equals that of the first 19 terms, then thesum of its first 30 terms, is(A) equal to 0 (B) equal to -1 (C) equal to 1 (D) non unique.