Question Detail
Question
The 9s complement of 6578 is
Correct Answer
Option D is the correct answer.
Detailed Explanation
To find 9's complement, subtract each digit from 9: 9-6=3, 9-5=4, 9-7=2, 9-8=1. So the 9's complement is 3421.
Hint
Subtract each digit from 9.