Question
Sun March 13, 2011 By: Nachiket Arora

find the value of the middle term of the following A.P. -6,-2,2,............,58.

Expert Reply
Sat March 12, 2011
dear student,
let there are n terms in this AP.
so
a=-6, d=4
nth term =58
so,
a+(n-1)d=58
-6+{[n-1](4)}=58
4(n-1)=64
n-1=16
n=17
so the middle term is the 9th term
9th term
=-6+[(9-1)(4)}
=-6+32
=26
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