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You have two 3-digit numbers, A: X7Y and B: ZW7. X, Y, Z and W represent unknown digits.

(a) If both of them are set to the largest possible number, which one is greater, A or B?

(b) If both of them are set to the smallest possible number, which one is less, A or B?

(c) What is the difference between the largest B and smallest A?

Correct!