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Explanation:

Given, (abc)5 = (cba)7

∴ 25a + 5b + c = 49c + 7b + a

⇒ 24a – 48c = 2b

⇒ b = 12(a – 2c)

Since b has to be a single digits number (a – 2c) has to be 0.

∴ b = 12 × 0 = 0

Hence, 0.

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