The prime factors of 140 are 2, 2, 5, and 7.
The prime factors of 124 are 2, 2, and 31.
The prime factors of 152 are 2, 2, 2, and 19.
The only common factors are 2 and 2. Include 1, and you find that the three numbers that will evenly go into 140, 124, and 152 are 1, 2, and 4.
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