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f(x) is a polynomial of degree 4 with re...

f(x) is a polynomial of degree 4 with real coefficients such that f(x)=0 is satisfied by x=1,2,3 only then f'(1).f'(2).f'(3) is equal to :`

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`f(x)=0" has roots 1,2,3 only".`
`rArr" "`Any one of 1,2 or 3 is a repeated root of f(x)=0
`rArr" "f'(1) or f'(2) or f'(3)" is zero "`
`rArr" "f'(1)cdotf'(2)cdotf'(3)=0`
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