क्या 21+ Lakhs Students Registration करेंगे ?

Partnership Deed And Registration

From The View Point Of Registration

How many motor vehicle registration number plates can be formed with the digits 1, 2, 3, 4, 5 (No digits being repeated) if it is given that registration number can have 1 to 5 digits?

In a row of students, Ravi is 21st from either end of the row. How many students are there in a row?