Statement1: if n in Na n dn is not a m...

Statement1: if `n in Na n dn` is not a multiple of 3 and `(1+x+x^2)^n=sum_(r=0)^(2n)a_r x^r ,` then the value of `sum_(r=0)^n(-1)^r a r^n C_r` is zero Statement 2: The coefficient of `x^n` in the expansion of `(1-x^3)^n` is zero, if `n=3k+1orn=3k+2.`

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