Electronics Engineering Interview Question:

What is the Value of binary number with n digit, all of which are unity?
a) 2 to the power n
b) 2 to the power (n-1)
c) (n square) - 1
d) (2 to the power n) - 1

Submitted by: Administrator

The answer is D
For eg. consider 1111 which has 4 digits
2^4=16
(2^4)-1=15
Submitted by: Administrator