Question: please check my answer if its not correct provide me the answer, thanks The coefficient of x 11 y 9 in the expansion of (2x

please check my answer if its not correct provide me the answer, thanks

The coefficient of x11 y9 in the expansion of (2x -3y)20 is:

( ( 2x )+( -3y ) ) 20 = please check my answer if its not correct provide me the answer,j=0 to 20 ( 20/j )( 2x )20-j ( -3y ) j

at j = 9

( 20 / 9) ( 2 )11 ( - 3 )9 x11 y9

The coefficient is: - ( 20 / 9 ) 211 39

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