2
12
−12
-2
Correct answer is B
(1+kx)8=8C0(18)(kx)0+8C1(17)(kx)1+...
The 5th term = 8C5−1(14)(kx)4
= 8C4(kx)4
⟹70k4=358
k4=35870
k4=116
k=12
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