discarding certain power terms in a polynomial

Question:discarding certain power terms in a polynomial

Posted: Athar Kharal 90 Product: Maple

February 17 2013

How I can get prd with only fifth and lower powers of x[n] in the following code?

p1:=a*x[n]+b*x[n]^3-c*x[n]^6:

p2:=d*x[n]^2-e*x^4+20:

prd:=collect(expand(p1*p2),x[n]);

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