Question

An arithmetic progression consists of 25 terms .the middle term is 20 .find sum of all terms

Answer 1

Answer:

500

Step-by-step explanation:

Lets say ‘a-12d,a-11d,a-10d,________,a-d,a,a+d,a+2d, ______,a+11d,a+12d are 25 term

Given a=20 which is middle term

Sum of all term =( a-12d)+(a-11d)+______+(a-d)+a+(a+d)+________+(a+11d)+(a+12d)

=25a (all terms of d will be canceled out)

=25*20=500.

Answer 2

Step-by-step explanation:

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