39 x 4 =156
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39 x 4 = 156
39!/34! x 5! = (39 x 38 x 37 x 36 x 35)/(5 x 4 x 3 x 2) = 575,757 of them
One solution is, 31 + (2 x 4) = 31 + 8 = 39 Another is, 42 - (1 x 3) = 42 - 3 = 39
4 with 3 remaining 39 - 3 = 36 = 9 x 4
x + 7y = 39 So x = 39 - 7y Substitute for x in the second equation: 3(39 - 7y) - 2y = 2 117 - 21y - 2y = 2 115 = 23y y = 5 Substitute this value for y back into the first equation: x + 7*5 = 39 x + 35 = 39 x = 4