If ax = b, by = c, cz = a, then the value of xyz is ?

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∵ a^x = b
⇒ log_a b = x

∵ b^y = c
⇒ log_b c = y

∵ c^z = a
⇒ log_c a = z

∴ xyz = log_ab x log_bc x log_ca = 1