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The Great Comparison (Posted on 2019-03-02) Difficulty: 3 of 5
A = 200..002/(100..0022 + 2)
B = 200..001/(100..0012 + 2)

Both the number expressions have 2019 zeros in the numerator and 2017 zeros in the denominator.

Which of the two numbers is greater?

No Solution Yet Submitted by Danish Ahmed Khan    
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Solution Puzzle Solution Comment 6 of 6 |

Let 10^2017 = n (say)
also, 200n+1= P (say)
and, n^2+2n+3=Q (say)
Then, we have:
           P+1             P
A-B = -------------- -  ----
           Q+2n+3      Q

so, the denominator is Q(Q+2n+3) which is obviously POSITIVE. 
The numerator is equal to:
(P+1)Q - P(Q+2n+3)
= Q - P(2n+3)
But, P(2n+3) 
= (200n+1)(2n+3)
=400 * n^2 + 602n+3
>  n^2 + 2n +3 
= Q
Accordingly,  
Q- P(n+3) < 0
Since the denominator is positive, it then follows that A < B
Consequently,  B is the greater number.

  Posted by K Sengupta on 2022-06-06 23:40:20
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