Question

If the n'th term of the A.P, -1,4,9,14...is 129.find thevalue of n.

Answer 1

Hey
nth term = a + (n-1)d
129 = -1 + (n-1)5
130 = (n-1)5
=>(n-1) = 130/5
(n-1) = 26
n = 27 ans.
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Answer 2

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