Using the concept of combination, the value of the expression 9C4 is 126
Recall the combination formula :
- [tex]nCr = \frac{n!} {(n-r)!r!} [/tex]
[tex]9C4 = \frac{9!} {(9-4)!4!} [/tex]
[tex]9C4 = \frac{9 \times 8 \times 7 \times 6} {4 \times 3 \times 2 \times 1} [/tex]
[tex]9C4 = \frac{3024} {24} = 126 [/tex]
Therefore, the value of the expression 9C4 is 126.
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