I.M.Possible What is impossible with men is possible with God

5Mar/100

Which one is larger?

Between these two numbers, which one is larger? 0.99999\ldots or 1?
At a quick glance, most people will say that 1 is larger than 0.99999\ldots

However, consider the following:
Let,
x=0.99999\ldots

Now,
10x = 9.99999\ldots
10x = 9 + x

By a simple algebra, we can find that
x = 1

It means that x=0.99999\ldots=1



Can anyone explain this? Does 0.99999\ldots really equal to 1?

4Mar/104

1=2?

I just found this old-time mathematical riddle again in some forum.

x^2 - x^2 = x^2 - x^2
x(x-x) = (x+x) (x-x)
x = x+x
1x = 2x
1 = 2

One is equal to two?! That's totally absurd.
Can you can spot the mistakes?