Question

numerical system used in computers?

Answer 1

binary

Answer 2

Decimal too - see BCD.

Answer 3

As a computer programmer or an IT professional, you need to understand the three mostcommon number systems that are frequently used in computers. Those number systems are 1.Decimal 2•Hexadecimal 3•Binary 4.octal

http://www.scribd.com/doc/7809787/Number-Systems-in-Computers

Answer 4

abhishek although you do need to learn hexadecimal, binary, and decimal, octal is almost never used