Find the number of ordered pair of positive integers (a.n) such that a^{n+1} − (a + 1)^{n }= 2001

0

1

2

3

none of these

Correct Answer : B

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?