Question

evaluate the expression. ₇c₁ a 3.5 b 7 c 1440 d 5040

Explanation:

Step1: Recall combination formula

The combination formula is \(_{n}C_{r}=\frac{n!}{r!(n - r)!}\). Here \(n = 7\) and \(r=1\).

Step2: Substitute values into formula

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Answer:

B. 7