Question

The power of x occurring in 7^th term in the expansion of $\left( \frac{4x}{5} - \frac{8}{5x} \right)^{9}$is-

• A. 3
• B. –3
• C. 5
• D. None

Answer 1

Answer: (B)

–3

Answer 2

T₇ = T₆₊₁ = ⁹C₆ $\left( \frac { 4 x } { 5 } \right) ^ { 3 }$ $\left( \frac{- 8}{5x} \right)^{6}$

® power of x = 3 – 6 = –3