If (1 + x + x^(2) + x^(3))^(n) = sum(r=0...

If `(1 + x + x^(2) + x^(3))^(n) = sum_(r=0)^(3n) a_(r) x^(r) "and" sum_(r=0)^(3n) a_(r) = k ` and if
` sum_(r=0)^(3n) r a_(r) = (lambda n k)/(2) ` , the value of ` lambda ` is

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