A is a 4-digit positive integer and B is the 4-digit positive integer formed by reversing the digits of A. If A-B is greater than zero and is divisibly by 45. Find the number of possible values of A

248

400

512

805

405

Correct Answer : D

A number exceeds its four seventh by 18. What is the number

If m and n (n > 1) are whole numbers, such that mn = 121, the value of (m – 1)n + 1 is

How many positive numbers less than 100000 are such that only the digits 5, 6, 7, 8, 9 are used in the number and the number is divisible by 4?