What will be the Odds ratio if the diseased with risk factor =a; diseased without risk factor=b; not diseased but with risk factor=c; and not diseased as well as not with risk factor=d?

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What will be the Odds ratio if the diseased with risk factor =a; diseased without risk factor=b; not diseased but with risk factor=c; and not diseased as well as not with risk factor=d?

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