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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??

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??
 

Grade:12th pass

1 Answers

Aditya Gupta
2081 Points
2 years ago
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 :)

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