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if in an A.P. ,a= 15,d= (-3) and an = 0, then find the value of n

Posted by Muskan Jangir 5 years, 8 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 5 years, 8 months ago

First term (a) = 15

Common difference (d) = -3

Last term (an) = 0

tn=a+(n-1)d

0=15+(n-1)-3

15=-3n+3

3n=15+3

n=18/3

n=6

0Thank You

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