3 x 13 = 39
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3x13 39x1
Assuming without repeats: 40C5 = 40!/(40-5)!5! = 40x39x38x37x36x35x34x...x2x1/(35x34x...x2x1)x(5x4x3x2x1) = (5x4x2)x(3x13)x38x37x36/5x4x3x2x1 = 13x38x37x36 = 658008
Well, darling, the distributive property states that when you have a number outside the parentheses being multiplied by the sum inside the parentheses, you can distribute that number to each term inside. So, in this case, 3 times 13 is simply 39. Easy peasy lemon squeezy.