Win-the-Game
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Problem
Editorial
Analytics

Two friends Kunal and Satyam are playing an interesting game. They take turns drawing a ball from a bag which initially contains R red balls and G green balls. Each player draws a ball alternatively and never put it back. The person who is the first to draw a red balls wins. Satyam always draws first. If there are no more balls in the bag and nobody has drawn a red ball, the satyam wins.

What is the probability of the Satyam winning?
Input:
The first line will contain the number of test cases T.
The first line of each test case will contain a number R (number of red balls) and G(number of green balls )

Output
For each testcase, print the desired probability.
Constraints:
1<=T<=10
0<=R,G<=10^3

Problem Setter : Surya Pratap Singh

SAMPLE INPUT
3
2 1
1 1
10 0
SAMPLE OUTPUT
0.666667
0.500000
1.000000
Time Limit: 2.0 sec(s) for each input file.
Memory Limit: 256 MB
Source Limit: 1024 KB

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