Question

9. Find the sum of first 25 terms of the AP 30, 26, 22, ....​

Answer 1

a=30 d= -4 A nth term=25

A nth term =a+(n-1)×d

a25=30+(25-1)× -4

a25 =30 +24 × -4

a25 =30-96

a25= -66

Answer 2

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