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hi,
see the coefficient of x^3 wii be the
sum of all the terms of form x * x * X * a * b
we have only to select a & b , for this we have to select two terms from (x-4)*(x-1)*(x+2)*(x+8)*(x+6).
these can be
( -4 *-1 ) or (-4 *2 ) or ( 2 * 8 ).................
adding all such terms
gives , 4 -8 -32 -24 -2 -8 -6 +16 +12 +48
= 0
so the coeff. of x^3 is 0
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