Coefficient of x3y4z2 in (2x−3y+4z)9 is
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Step-by-step explanation:
(a+b+c)2 = a2 +b2 +c2 +2ab+2abc+2ca
(2x+3y+z)2 =4x2+ahe+1bz2+
12xy +24yz+16zx
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