The number of 3 digit numbers, that are divisible by either 3 or 4 but not divisible by 48, is :

The number of numbers, strictly between 5000 and 10000 can be formed using the digits 1, 3, 5, 7, 9 without repetition, is :

$$\sum\limits_{k = 0}^6 {{}^{51 - k}{C_3}} $$ is equal to :

The number of integers, greater than 7000 that can be formed, using the digits 3, 5, 6, 7, 8 without repetition is :