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

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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

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