1, 2, 3, 6, 7, 14, 21, 42
1, 7, 49
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2,058
42, 44, 45, 46, 48, 49.
42
One and seven.
By inspection, the only two numbers between 40 and 50 that have a GCF of 7 are 42 and 49.Another way to work out this problem is to list the multiples of 7. They are:7, 14, 21, 28, 35, 42, 49, 56, ...The values between 40 and 50 are 42 and 49.