For what it's worth, it's not as if you have to solve EVERY problem in under two minutes. That's just the average. This is a particularly difficult 700+ question!
s1: put a= 0 and b =5 then the cirlce touches y axis but if the center is 3, 8 then the cirlce never touches y axis so, not sufficient Image may be NSFW.
Clik here to view.
s2: this clearly shows, a is not equat to 0 so, it never touches y axis so sufficient.
but took more than 2 minutes to solve Image may be NSFW.
Clik here to view. Image may be NSFW.
Clik here to view.[/quote]
s1: put a= 0 and b =5 then the cirlce touches y axis but if the center is 3, 8 then the cirlce never touches y axis so, not sufficient Image may be NSFW.
Clik here to view.
s2: this clearly shows, a is not equat to 0 so, it never touches y axis so sufficient.
but took more than 2 minutes to solve Image may be NSFW.
Clik here to view.
Image may be NSFW.Clik here to view.
[/quote]
