Find a three-digit number that can be divided without a remainder by 7, 8, or 9.
| July 23, 2021 | education
Consider the case where the number is divisible by 7:
a, x is the first digit, b, y is the second digit.
x = a, y = a * a + b.
If (ab – xy) is a multiple of 7.
You can also use a simpler method and multiply all the numbers, we get:
7 * 8 * 9 = 504.
Answer: 504.
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