Factorial Quiz

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Mathematics → Factorial Quiz

Factorial Multiple Choice Questions (MCQs) Page-1. The following quizzes are from factorial, permutations and combinations. Find answers and solutions to the questions at the bottom of the page.

Pages: 1 | 2

1. 0!=?
(A) 0
(B) 1
(C) 10
(D) undefined

2. n(n-1)\times...\times3\times2\times1=?
(A) n!
(B) ^nC_r
(C) ^nP_r
(D) n

3. 7!=?
(A) 70
(B) 120
(C) 720
(D) 5040

4. 5\times4!=?
(A) 90
(B) 105
(C) 120
(D) 135

5. {\Huge \frac{6!}{4!}=? }
(A) 24
(B) 26
(C) 28
(D) 30

ANSWERS: FACTORIAL QUIZ
1. B
2. A
3. D
4. C
5. D

SOLUTIONS: FACTORIAL QUIZ

1. 0!=1
By definition zero factorial is always equal to 1.

2. n!=n(n-1)\times..\times3\times2\times1
This is the definition of factorial. For example
4!=4\times3\times2\times1
5!=5\times4\times3\times2\times1

3. 7!=7\times6\times5\times4\times3\times2\times1=5040

4. 5\times4!=5\times4\times3\times2\times1=120

5.