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If alpha,beta are the roots of x^2+p x+q...

If `alpha,beta` are the roots of `x^2+p x+q=0` and `gamma,delta` are the roots of `x^2+p x+r=0,` then `((alpha-gamma)(alpha-delta))/((beta-gamma)(beta-delta))=`
(a)`\ 1` (b) `\ q` (c)`\ r` (d)`\ q+r`

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