A) 87
B) 88
C) 89
D) 90
Correct Answer: C
Solution :
\[a+6d=34\] ?(i) \[a+12d=64\] ?(ii) Solving equation (i) and (ii) \[a=4,d=5\] \[{{T}_{18}}=a+17d\Rightarrow {{T}_{18}}=4+17\times 5\] \[=89\]
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