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Grade: 12th pass
        
no. of divisors of a number =n ..then find the no. of proper divisors of the number?
 
in some places ,it is given n-1; (excluding n)
 
in some other it is given n-2;(Excluding 1 and n).
 
which one is correct??
 
7 months ago

Answers : (1)

Aditya Gupta
2015 Points
							
the correct answer is n – 1, in which only n is excluded.
1 is ALWAYS a proper divisor of every positive integer n, except for n= 1 as in that case 1 and n are identical. so 1 has NO proper divisor. 
eg. proper divisors of 6 are: 1, 2. 3
kindly approve :)
7 months ago
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