The decimal number 3 is in binary the 2s column plus the 1s column.

a. 11
b. 12
c. 20
d. 21

The answer is "Option a"

Explanation:

In the given question the correct answer is the option a because when we change decimal number 3 into a binary number, It will give "11". To know its decimal number we add both numbers.

binary to decimal (11)₂=?

∴ 2¹=2 and 2⁰=1

= 1×2¹+1×2⁰

∵ 1×2+1×1

=2+1

=3

and other options are not correct, that can be described as follows:

In option b, option c, and option d, The computer understands the only binary language, that contains only 0 and 1, and in these options, It contains other value, that's why it is not correct.

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