Write down any three-digit number (for example, 425). Make a six-digit number by repeating these digits in the same order (425425). Your new number is divisible by 7, 11, and 13.Examine why they work ?
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7, 11, 13
1001.487×1001=487487
7×11×13=1001
1001.487×1001=487487
7×11×13=1001
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