Question

Decimal equivalent of one’s complement of 11111001 is?

(a) 5

(b) 6

(c) 4

(d) 10

I have been asked this question by my school principal while I was bunking the class.

Asked question is from Number Theory in division Number Theory and Cryptography of Discrete Mathematics

Answer 1

Correct option is (b) 6

To explain: One’s complement of that number is 00000110 which is 6 in decimal.