Multiple choice How many 4 digit numbers can be there in an octal number system? 48 84 4 * 8 4 + 8 48 Reveal answer Fill a bubble to check yourself B Correct answer Explanation At each of the 4 places in a 4 digit number in octal number system, we have 8 options. So, we can have 8 * 8 * 8 * 8 = 84 combinations of 4 octal digits. Hence, these many numbers can be there.