Question

Find the binary equivalent of the decimal number 21 ?
1. (11101)₂
2. (10101)2
3. (10100)₂
4. None of these

Answer 1

Correct Answer - Option 2 : (10101)2

Concepts:

Convert decimal to binary

Conversion steps:

• Divide the number by 2.
• Get the integer quotient for the next iteration.
• Get the remainder for the binary digit.
• Repeat the steps until the quotient is equal to 0.

Calculation:

Here, we have to find the binary equivalent of 21

2	21
2	10	1
2	5	0
2	2	1
	1	0

 

So, the binary equivalent of 21 is 10101

i.e (21)₁₀ = (10101)₂