find the sum of mid term of the A.P 213,205,197....37
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t1=213
d=-8
tn=a+(n-1)d
37=213+(n-1)-8
37-213=(n-1)-8
-176=(n-1)-8
-176/-8=(n-1)
22=(n-1)
22+1=n
n=23
middle term is 12
t12=213+(12-1)-8
=213+11(-8)
=213-88
=125
Sn=n/2[a+(n-1)d]
S12=6[125]
=750
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hope it helps
since only 1 mid tterm...so ans is -3 only
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