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Bigger or Smaller?? (Posted on 2007-02-22) Difficulty: 3 of 5
Given that x=111110/111111, y=222221/222223, z=333331/333334, which is the biggest and which is the smallest?

No Solution Yet Submitted by Ansh    
Rating: 1.7500 (4 votes)

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Solution An Alternative Mehodology Comment 6 of 6 |

We know that if p> q, then:

p/(p+1) - q/(q+1)

= (p-q)/((p+1)(q+1)), and so:

p/(p+1)>  q/(q+1), whenever both p and q are positive with p> q .....(*)

Now,

x= 111110/111111

y = 222221/222223 = (111110+ 1/2)/(111111+ 1/2)

z = 333331/333334 =  (11110 + 1/3) /(111111+ 1/3)

Since 11110 < 11110 + 1/3< 11110 + 1/2, it now follows from (*) that:
x<  z<  y

Consequently, it follows that x is the smallest.

Edited on July 26, 2007, 9:54 am
  Posted by K Sengupta on 2007-07-26 06:05:00

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