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1.
Bill noted the new number in his little book. "They've given you the same figures as my 4-digit number," he said. "That's funny." "So they have," John agreed. "But our first and second digits are interchanged, and so are our third and fourth. As you say, the same four figures, but yours is four times my number." What was Bill's number?
9381
8372
7128
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