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To simplify `(p-q)/(p-r)*(q-r)/(q-p)*(r-p)/(r-q)` let us take a negative, (-)ve sign common from the denominator because as per the rule of signs when you multiply:1. two positives make a positive, 2. two negatives make a positive, 3. a negative and a positive make a negative, 4. a positive and a negative make a negative:
So, we get:
Cancelling the like terms from the numerator and denominator
Therefore, the required answer is -1.
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