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15C3 = 455
There are four different groups of three, each of which can be arranged in six different ways so your answer is 24.
There are many different ways to divide the real number system into sub-groups. Perhaps the most obvious division is, positive numbers and negative numbers.
5 groups of 5. 25/5=5 ; 5 x 5 = 25.
There are infinitely many different ways to make groups of fractions that sum to 1.