1,2,4,7,14,28
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LCM(15, 28) = 420
1 2 4 7 14 28
The number that can go into both 28 and 100 is 4. This is because 28 divided by 4 equals 7 with no remainder, and 100 divided by 4 equals 25 with no remainder. Therefore, 4 is a common factor of both 28 and 100.
Since 11 is a prime number and does not evenly go into 28 or 2, then the least and only common denominator is 1.
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