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kiruha [24]
3 years ago
11

What is 7P4 A: 28 B: 35 C: 210 D: 840

Mathematics
2 answers:
Semmy [17]3 years ago
4 0

Answer:

D

Step-by-step explanation:

using the definition of nP_{r} = \frac{n!}{(n-r)!}

where n! = n(n- 1)(n - 2)......× 3 × 2 × 1

here n = 7 and r = 4, hence

7P_{4}

= \frac{7!}{3!}

= \frac{7(6)(5)(4)(3)(2)(1)}{3(2)(1)} ← cancel 3 × 2 × 1 leaving

7P_{4} = 7 × 6 × 5 × 4 = 840 → D


pav-90 [236]3 years ago
3 0

Answer:

C. 210

Step-by-step explanation:

Evaluate the expression. Choose the best answer.

A. 840

B. 120

-C. 210-

D. 2,520

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