Q. Which of the following are in descending order of their value ?

1. 1\\ 3, 2\\5, 3\\7, 4\\5 ,5\\6, 6\\7
2. 1\\3,2\\5,3\\5,4\\7,5\\6,6\\7
3. 1\\3,2\\5,3\\5,4\\6,5\\7,6\\7
4. 6\\7,5\\6,4\\5,3\\7,2\\9,1\\5