13. If a = xy^P – 1, b = xy^q–1 and c = xy^r-1 prove that
a^q-r.b^r-p.c^p-q= 1.​

13. If a = xy^P – 1, b = xy^q–1 and c = xy^r-1 prove that
a^q-r.b^r-p.c^p-q= 1.​

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