Answer and Explanation
Your Answer is
Correct Answer is A
Explanation
The denominator becomes k+1 after the denominator is reduced, and the numerator becomes k. Choose A.
57. If k is an integer and k > 2, which of the following expressions is equivalent to 
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(Note: For any positive integer n. n! = (n)(n-1)(n-2)…(2)(1). Hence 5! = (5)(4)(3)(2)(1)=120.)