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If 1,w,w^2,.....w^(n-1) are then n, nth ...

If `1,w,w^2,.....w^(n-1)` are then `n,` nth root of unity, then `(2-w)(2-w^2).....(2-w^(n-1)`) equals. (i)`2^n` (ii)`.^nC_2.....^nC_n` (iii)`[.^2nC_0+.^(2n+1)C_1+.^(2n+2)C_2...........+.^(2n+2)C_n)]^(1/2)` (iv) `2^n+1`

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