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If (1+a x)^n=1+6x+27/2x^2+.....+ a^n x^n...

If `(1+a x)^n=1+6x+27/2x^2+.....+ a^n x^n` then the value of `a and n` are respectively (i)`2,3` (ii)`3,2` (iii)`3/2,4` (iv)`1,6` (v)`3/2,6`

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