Exact result
126
9 choose 4 without repeats is 126.
9 choose 4 counts unique groups of 4 drawn from 9 distinct items. Reordering the same 4 chosen items does not create a new group.
Worked steps
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- Inputs: n = 9, r = 4
- Formula: C(n, r) = n! / (r!(n-r)!)
- Substitute: C(9, 4) = 9! / (4!(9-4)!)
- Steps: 362,880 / (24 x 120)
- Result: 9 choose 4 without repeats is 126.
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9 choose 4 counts unique groups of 4 drawn from 9 distinct items. Reordering the same 4 chosen items does not create a new group.
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