x78
7x616
7x54
35x48
Correct answer is B
(x2−1)8=8C8(x2)8(−1)0+8C7(x2)7(−1)1+8C6(x2)6(−1)2+...
The third term in the expansion =8C6(x2)6(−1)2
= 8!6!2!(x664)(1)
= 28×x664=7x616
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