Write four basic rules for adding binary digits?

Write the rules for sign convention.

Find the number of four digited number that can be formed using the digits 1,2, and 3.

Write the greatest four digit number?

Write the greatest four digit number?

Write four digit numbers as many as possible with 4,0,3,9

Write four digit numbers as many as possible with 2,4,6,8

Make the greatest and the smallest four digit number using any four-digits number with digit 5 always at thousand place

The number of four-digit numbers formed by using the digits 0,2,4,5 and which are not divisible by 5, is

Write four important minerals of sodium and write their composition.