If we have to find the number of values between any two numbers without including those number, for example= to find out number of values between 124 and 16, do we proceed with simple subtraction? Or will that include the value 124?

Hi
If the question says between 16 and 124 without including those so the number of values will be from 17 to 123 which is 123-17+1=107
If you have to calculate number of values from a to b such that both are included then total number of values wil be (b-a+1)

Including both number 124-16 +1 = 109
excluding both number 124-16-1 = 107
Excluding any one number 124-16 = 108

(124-16)+1