It looks like you are asking how many combinations of 6 numbers are there in the 28 numbers 1 through 28. This is known as the number of combinations of 28 things taken 6 at a time. The answer is 28!/(6!22!) (n! means n factorial, which is the product of all the integers from 1 to n). I get 376,740 if I haven't made an error in arithmetic.
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5They are 1,2,4,7,14, and 28
There are approx 5.709*10^45 possible sets of numbers that can be made out of the composite numbers in 1 and 200.
There are an infinite number of possibilities, including fractions, and sets where two of the three numbers are negative. For positive integers, the sets are: 1, 1, 56 1, 2, 28 1, 4, 14 1, 7, 8 2, 2, 14 2, 4, 7
9 with 1 remaining 28 - 1 = 27 = 3 x 9
28/24 = 1 and 4/24 = 1 ans 1/6 days