Question

5. How many different odd numbers of 4 digits can be formed with the digits 1.2.3.4.5.6.7: the digits in
any number being all different?
(Ans: 480)​

Answer 1

Answer:

by adding or what?

please let me know!

Answer 2

Answer:

given digits

1,2,3,4,5,6,7

odds no's:1,3,5,7

unit place can be filled with any of the four numbers in 4p1 ways

remaining 3 places can be filled with any of the 6(7-1) digits in 6p3 ways

4p1 * 6p3 = 4 * 120 = 480