\[\begin {array} {1 1} (a)\;\frac{p^2}{p^2+q^2} & \quad (b)\;\frac{p^2}{(p+q)^2} \\ (c)\;1-\frac{p}{(1-q)^2} & \quad (d)\;\frac{p^2}{p^2+(1-q)^2} \end {array}\]

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