There are N stars in the sky. A manual attempt at counting yielded K stars. It is possible that the same star may have been counted more than once. You need to determine the probability that any star may have been counted more than once. Probability can be represented as a rational number \( \frac{\textstyle P}{\textstyle Q} \). If Q is not divisible by \(10^9 + 7\) there is a unique integer \(x \mid 0 \leq x \lt 10^9 +7\) where \( P \equiv Qx\) \(\%\) \((10^9 +7)\). Calculate value of this integer x.

Input Format:
First line of input consists of a single integer T denoting number of test cases.
Following T lines contain two space separated integers denoting N and K.

Output Format:
Print the answer to each test case in a new line.

Input Constraints:
\(1 \le T \le 10\)
\( 1 \le N, K \le 100000\)