​sir

If the gerneral term in the above expansion contains x2y4z6 then r+t=2,r+s=4 and s+t=6Also, r+s+t=6Solvind these equation, we getr=0,t=2 and s=4Coefficient of x2y4z6 =6!0! 2! 4!=6×5×4!2×4!=15

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