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10P6 =

 

_10!_

(10-6)

 

answer = 151200

 

 

(3x-4y)3 = 3C0 (3x)3 (-4y)0 + 3C1 (3x)2 (-4y)1 + 3C2 (3x)1 (-4y)2 + 3C3 (3x)0 (-4y)3

 

= 1 (27x2 ) + 3 (9x2) (-4y) + 3 (3x) (16y2) + 1 (-64y3)

 

= 27x2 108x2y + 144xy2 64y3