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If the nth term of the AP -1, 4 ,9 14 ............. is 129 find the value of n.

Posted by Susma Chatterjee 4 years, 6 months ago

CBSE > Class 10 > Mathematics

2 answers

Ronit Gola 4 years, 6 months ago

Given a = -1 an = 129 d = 5 We know that, an = a + (n-1)d 129 = -1 + (n-1)5 130 = 5(n-1) n-1 = 130/5 n-1 = 26 *n = 27*

1Thank You

Raghav Agnihotri 4 years, 6 months ago

N=27

2Thank You

ANSWER

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