In how many ways different objects can be divided into groups such that a group contains three objects each.
The given information is:
Number of objects
Number of groups
Number of objects in each groups
Pick first objects from objects,
Total no. of ways of choosing is:
Pick last objects from remaining objects and the number of ways this can be done is .
Since the two groups are similar, there is no differentiation between them. Therefore, we need to divide it with .
The total numbers of ways:
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