In a town, the car plate numbers contain only three or four digits, not containing the dit 0. What is the maximum numbers of cars that can be numbered?

The number of 3- digit numbers containing the digit 7 exactly once :

How many numbers each containing four digits can be formed ,when a digit may be repeated any number of times?

Which of the following contains the maximum number of unpaired electrons?

Which of the following contains the maximum number of unpaired electrons?

Which of the following contains maximum number of molecules ?

Find the number of n digit numbers, which contain the digits 2 and 7, but not the digits 0, 1, 8, 9.

Find the number of n digit numbers, which contain the digits 2 and 7, but not the digits 0, 1, 8, 9.

Determine the following for the fouth shell of an atom (a)The number of orbitals in each subshell (b) The maximum number of electrons that can be contained in each subshell (c ) The maximum number of electrons that can be contained in the shell

Which of the following contains maximum number of nitrogen atoms ?