How do you write 2 in binary?

To write the number 2 in binary, you represent it as "10." In the binary system, each digit represents a power of 2, starting from the right. The rightmost digit represents (2^0) (1), and the next represents (2^1) (2). Since 2 is equal to (2^1) and there are no (2^0)s, it is written as "10."