The answer is 28C6 = 28*27*26*25*24*23/(6*5*4*3*2*1) = 376,740
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There are 8145060 combinations.
The number 28 has 6 factors. Factors are numbers that can be multiplied together to get the original number. The factors of 28 are 1, 2, 4, 7, 14, and 28. This can be determined by finding all the pairs of numbers that multiply together to equal 28.
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28 to the 2nd power
29 - 28 = 1 141 + 1 = 142