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The sum of given A.P.1, 4 , 7 , 10 , . . . upto 20 terms is____________ . Your answer

Posted by Pranjal Jangid 5 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years ago

Given AP is 1,4,7,10,.....

In given AP first term a=1, common difference d=3

Since, Sn= n/2[2a+(n−1)d] ....... sum of n terms

Put n=20 for sum of first 20 terms

S20=20/2 [2(1)+(20−1)3]

S20=10[2+57]

S20=590

0Thank You

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