3x-5y+7z by -3xyz
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Step-by-step explanation:
Consider the following three polynomials
P1(a)=∑35i=1a3i
P2(a)=∑21j=1a5j
P3(a)=∑15k=1a7k
The co-efficient of a105 in the product of the above three polynomials will be the count of the positive integral solutions to 3x+5y+7z=105 .
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