c^r = a (b^q)^r = a b^qr = a (a^p)^qr = a a^pqr = a সুতরাং pqr = 1 (Showed)
c^r=a =>(b^q)^r=a^1 =>b^qr=a^1 =>(a^p)^qr=a^1 =>a^pqr=a^1 =>pqr=1 [proved]
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