Math, asked by gurleen726, 1 year ago

sum of 30 terms of a series in AP whose last term is 98 is 1635 find the first term and the common difference

Answers

Answered by vish5102004
15
a+29d=98 -equation1
sum of 30 terms is 1635
30/2 (2a+29d)=1635
put value of a+29d
15*(a+98)=1635
a=11
so d is 3

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vish5102004: thenwhat is answer
gurleen726: first term is 11 and common difference is 3
gurleen726: then solve it
gurleen726: then solve it
vish5102004: ok
vish5102004: mnethodi mistake kar di thi
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Answered by harshitasharma58
15
here the first term is 11 and the difference is 3
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