Let Sn denote the sum of first terms of an arithmetic progression. If S20=790 and S10=145, then

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Let S denote sum of first n terms of an arithmetic progression.If S20 790 and S10 145 then S15-S5 is

Let Sn denote the sum of first n terms ofarithmetic progression.If S20 =790 and S10=145 then S15-S5

Let Sn denote the sum of first n-terms of an AP. If S20 = 790, S10 = 145, then S15 – S5 is equal to

Let Sn denote the sum of first n terms an arithmetic progression. If S20 = 790 and S10 = 145, then

Let Sn sum first n terms AP. If S10 = 390 and the ratio tenth & fifth terms is 15 : 7, S15 – S5 i

Find the sum of first n terms of an arithmetic progression

SUM OF ARITHMETIC PROGRESSION (A.P)

The sum of the first 7 terms of an A.p is 140 and the sum of the next 7 terms of the same A.p is 385