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If the coefficients of x^7 in (ax^2 + 1/...

If the coefficients of `x^7` in `(ax^2 + 1/(2bx))^11 and x^(-7)` in `(ax-1/(3bx^2))^11` are equal to

A

`64ab=243`

B

`729 ab =32`

C

`32ab=729`

D

`234 ab=64`

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