Use the binomial theorem to find the coefficient of xªy^b in the expansion of :(2x³ – 4y^2)7, where а) а %3D 9, b %3D 8. b) а %3D 8,b %3D 9. c) a = 0, b = 14. d) a = 12, b = 6. е) а = 18,b= 2.

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