Question

Which number system is used by humans from the long time?

Answer 1

Answer:

decimal number system which contains digits 1,2,3,4,5,6,7,8,9,0

Explanation:

There are more type number systems:

Example:

Binary number system which contains digits only 1,0.

Octal number system which contains digits only  1,2,3,4,5,6,7,0.