The average of the four digit numbers that can be formed using each of the digits $3,5,7$ and 9 exac

Question

The average of the four digit numbers that can be formed using each of the digits $3,5,7$ and 9 exactly once in each number is

Professor PC Thomas Classes · Answer

Sum of the 4 digit numbers is \ $ 6 	imes(3+5+7+9) 	imes 1111=6 	imes 24 	imes 1111 $ Total number of numbers is 24 ∴ Average is $\frac{6 	imes 24 	imes 1111}{24}=6666$ $$  $$