Math, asked by purnimatambe23, 3 months ago

2) If the seventh term of an A.P.is - 18, find the sum of its first 13 terms.

Answers

Answered by amitsharma777222999

0

Step-by-step explanation:

a+6d=-18

s13=13/2(2a+(13-1)d

=13/2 (2a+12d)

=13(a+6d)

=13*-18=-234

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