The term without `x` in the expansion `(2x-1/(2x^2))^(12)` is a. 495 b. -495 c. -7920 d. 7920

Explanation

Suppose the `(r+1)` th term in the given expansion is independent of `x`.


Then, we have:


`T_{r+1}={ }^{12} C_{r}(2 x)^{12-r}(frac{-1}{2 x^{2}})^{r} `


`=(-1)^{r 12} C_{r} 2^{12-2 r} x^{12-r-2 r}`


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