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Write a program that reads an integer in [0,20] and displays its factorial, else display Invalid number. Note: n!=1*2*3*....*n , 0!=1.

Sample Input 1:

5

Sample Output 1:

120

Sample Input 2:

21

Sample Output 2:

Invalid number

 

References: C From Theory
[Normal] Coding (C) - asked in Introduction to Computer Programming I (C) by (20.9k points)
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