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If a=xy^(p-1),b=yz^(q-1),c=zx^(r-1), the...

If `a=xy^(p-1),b=yz^(q-1),c=zx^(r-1)`, then `a^(q-r)b^(r-p)c^(p-q)` is equal to

A

abc

B

xyz

C

0

D

None of the above

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