Question

Suppose you do not have ten digits, as we usually do, but only two: 1 and 0.

How many 3 digit numbers are there with 0 and 1 only?

Answer 1

There are 8 possible combinations of 3-digit numbers with 0 and 1 only

Explanation:

lets take 000 as the first term. Now follow binary addition rule and add 1 in 000.This term will become 001. Like wise do it with every answer until you get 111.

000

001

010

011

100

101

110

111