Answer :
Given first term (a) = 18
Common difference (d) = n2-n1 = 15
- 18 = 2.5
an = -47
⇒ an = a + (n-1)d
-47 = 18 +(n-1) 2.5
65 = (n-1) 2.5
(n-1) = 26
n = 27
Therefore -47 is 27th term of the series
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