Question

How many numbers greater than 56000 can be formed by using the digits 4,5,6,7,8 no digits being reapeated in any no?

Answer 1

Answer:

Step-by-step explanation:

5600_

this space can be filled  by 5 ways

560_ _

this spaces can be filled by 20 ways

56_ _ _

this spaces can be filled by 60 ways

5 _ _ _ _

here first space should not be less than or equal to 6

this spaces can be filled by 48 ways

_ _ _ _ _

here first cannot be less than or not equal to 5

this spaces can be filled by 72 ways

therefore no. of numbers = 5+20+60+48+72=305