find the middle term of the AP 18, 15, 22, 505
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statement might be 8, 15, 22,......., 505
then first find number of terms n
if n is odd there is only one middle term that is (n+1)/2
if n is even there are 2 middle terms
n/2, (n + 2)/2
then first find number of terms n
if n is odd there is only one middle term that is (n+1)/2
if n is even there are 2 middle terms
n/2, (n + 2)/2
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