Question

find the sum of first 7terms of ap 10,6,2 ​

Answer 1

a = 10,d = 6-10= -4, n = 7

So,a7 = a+6d

a7 = 10+6×-4 = 10-24 = -14

Hence,

S7 = n/2(a+a7)

S7 = 7/2(10-14)

S7 = 7×-2

S7 = -14

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