If ninN,ngt4 and (1-x^(3))^(n)=sum(r=0)^...

If `ninN,ngt4 and (1-x^(3))^(n)=sum_(r=0)^(n)a_(r)x^(r)(1-x)^(3n-2r)`, then `sum_(r=0)^(n)a_(r)=lambda^(n)`, find lambda.

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