A) -25
B) 25
C) -36
D) -35
Correct Answer: A
Solution :
\[ad+a+a+d=33\Rightarrow a=11\] \[a({{a}^{2}}-{{d}^{2}})=1155\] \[121-{{d}^{2}}=105\] \[{{d}^{2}}=16\Rightarrow d=\pm 4\] If d = 4 then Ist term = 7 If d = -4 then Ist term = 15 \[{{T}_{11}}=7+40=47\] OR \[{{T}_{11}}=15-40=-25\]You need to login to perform this action.
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