Find the middle term of ap 6 13 20 dash dash dash 216
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A=6
d=7
Tn= a+ (n-1)d
216=6+(n-1)*7
n=31
total no. of terms=31
middle term=(31+1)/2
=16th
T16= a+(16-1)d
= 6+(15*7)
=111
therefore the middle term of the AP is 111
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