17
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The number is infinite, but here are the first few: 249, 498, 747, 996, 1245, 1494, 1743, 1992, 2241, 2490.
Henry Pelham
1,743 minus 1,786 is -43.
83 years.
A multiple of both 3 and 7 is a number that can be evenly divided by both 3 and 7 without leaving a remainder. To find the least common multiple of 3 and 7, you can simply multiply the two numbers together since 3 and 7 are prime numbers and have no common factors other than 1. Therefore, a multiple of both 3 and 7 would be 21.