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Old 07-24-2007   #4
ignoramus_the_great
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n= 7, r = 47C4 = 7!/(7-4)! 4!7C4 = (7x6x5x4x3x2x1) / (3x2x1) (4x3x2x1)7C4 = 5040 / 6x24 = 5040/144 = 35