The only common factor of 15, 20 and 24 is 1.
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One and three.
It is 20, the number in the middle when they are arranged in order.
The sequence of differences between consecutive numbers is 9, 1, -20, 9, 1. If this continues then the next difference is -20 and therefore the seventh number is -5. (15 - 20).
No
24 * .15 = 2.4 + 1.2 = 3.6