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The sum of first 25 terms of an AP whose nth term is 2-3n, is

Posted by Soniya Rana 5 years, 3 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 5 years, 3 months ago

Put n =1

put n =2

put n =3

So, A.P. become s: -1 , -4 , -7, ........

So, first term =a= -1

Common difference d = -4-(-1)=-7-(-4)= -3

Formula of sum of first n terms :

Put n =25

Hence the sum of first 25 terms of an AP is -925

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CBSE > Class 10 > Mathematics