1. Four balls, numbered 1 to 4, are placed in a bag. Three balls are removed one at a time. The three numbers are added. What sum is not possible?
a. 9
b. 5
c. 7
d. 6​

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The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

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