Riddle (2): It is a distinct four digit, non-zero number.

Riddle: 

It’s a four digit, non-zero number. Only one number does fit the below condition. What is that number?

Conditions:

Assume, pqrs is the number.

1. The First number (p) minus the second number (q) is same as the fourth number (s) minus the third number (r) and the number is one.

2. Third number (r) minus the second number (q) is same as the fourth number (s) minus the first number (p) and the number is same as the first number (p) minus the second number (q).

3. The First number (p) plus the third number (r) is same as the second number (q) plus the fourth number (s) and the number is 10

Date of Writing: 02/27/2015