Math, asked by ashishverma5021, 1 year ago

The sum of first 25 term of an ap whose 13th term is 20 is

Answers

Answered by 23232

3

Answer =500

Step-by-step explanation:

a+12d=20

multiply eq by 2

2(a+12d)=40

2a+24d=40. (1)

S25=25/2(2a+24d)

=25/2*40 from (1)

=25*20=500

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