This question tests the understanding of factorial notation and the formula n!/(n-r)!. From the context, we know that n! = $1 \times 2$ × 3 × ... × n and nP_r = n!/(n-r)!. To evaluate such expressions, we expand the numerator factorial and cancel common terms with the denominator. This technique is demonstrated in Example 6 of the textbook where 7!/5! = $7 \times 6$ = 42.