can be written as



We try A = 1, 2, and 3

First we try A=1



No, 1 is too small for A.

So we try A=2



No, 2 is still too small for A.

So we try A=3



No, 3 is too large for A.

So now we know that A is between 2 and 3.



can be written as



We try B = 1, 2, and 3

First we try B=1



No, 1 is too small for B.

So we try B=2




No, 2 is too large for B.

So now we know that B is between 1 and 2.

Since we know that A is between 2 and 3, and
we know that B is between 1 and 2, and --

we know that a number between 2 and 3 is greater
than a number between 1 and 2. 

So which is greater, A or B?  You answer!  

Edwin