Question

7 The sum of first 26 terms of the A.P.6,2....
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Answer 1

AP : 6,2.....

a = 6

d =-4

Sn= n/2(2a +(n - 1)d)

S26 =26/2(2(6) +25(-4)

S26 =13(12 - 100)

S26 =13(-78)

S26 = -1014

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Answer 2

Answer:

- 1144

Step-by-step explanation:

26/2(2(6) +25(-4) = - 1144