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If in an a.p, a=15,d=-3 and …

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If in an a.p, a=15,d=-3 and an=0, then find the value of n.

Posted by Aryan Rana 6 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 6 years, 9 months ago

a = 15 d = -3 an = 0
an = a+ (n - 1)d
15+(n -1)(-3) = 0
15 - 3n + 3 = 0
- 3n + 18 = 0
-3n = -18
n = 18/3 = 6

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