PROBLEM6:  AVERYEASYPROBLEM

Problem Statement:

Given two numbers a and b find the value of a!/b!

Input:

The first line consists of an integer t, the number of test cases. Then the next t lines consists of two integers a and b.

Output:

For each test case print the value of factorial(a)/ factorial(b)

Input Constraints:

1<=t<=100

0<=b<=a<=15

Example

Sample Input:

3

15 0

13 2

1 0

Sample Output:

1307674368000

3113510400

1