2014 Mania!

Algebra Level 5

Well yeah, Isn't it 2014? Try out this problem which literally wracks your nerves until you get the logic behind it.

Your job is to compare X,Y And Z.


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x<y<z y<x<z z<x<y x<z<y

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1 solution

Boris Barron
Aug 23, 2014

A c t u a l l y t h e s o l u t i o n i s f a i r l y s i m p l e , o n c e y o u f a c t o r o u t 201 4 2013 f r o m t h e n u m e r a t o r a n d d e n o m i n a t o r y o u g e t t h e f o l l o w i n g : x = 2016 2015 2014 2013 y = 2016 2015 2015 2014 z = 2014 2013 2016 2015 N o w t h e r e a r e t w o w a y s t o s o l v e t h i s , o n e i s t o p l u g i n t h e v a l u e s , a n o t h e r i s t o r e a l i z e t h a t a s t h e n u m b e r s g e t b i g g e r t h e y g e t l e s s f u r t h e r a p a r t . F o r e x a m p l e : 2 1 > 3 2 . W i t h t h a t i n m i n d , 2016 2015 < 2015 2014 < 2014 2013 S o , 2016 2015 2014 2013 < 2016 2015 2015 2014 b e c a s e a s d e n o m i n a t o r b e c o m e s s m a l l e r t h e n u m b e r b e c o m e s b i g g e r a n d 2014 2013 2016 2015 i s t h e o n l y n u m b e r g r e a t e r t h a n 1. S o , x < y < z Actually\quad the\quad solution\quad is\quad fairly\quad simple,\\ once\quad you\quad factor\quad out\quad \sqrt { 2014^{ 2013 } } from\quad the\quad numerator\quad and\quad denominator\quad you\quad get\quad the\quad following:\\ x\quad =\quad \frac { \sqrt { 2016 } -\sqrt { 2015 } }{ \sqrt { 2014 } -\sqrt { 2013 } } \quad y\quad =\quad \frac { \sqrt { 2016 } -\sqrt { 2015 } }{ \sqrt { 2015 } -\sqrt { 2014 } } \quad z\quad =\quad \frac { \sqrt { 2014 } -\sqrt { 2013 } }{ \sqrt { 2016 } -\sqrt { 2015 } } \\ Now\quad there\quad are\quad two\quad ways\quad to\quad solve\quad this,\quad one\quad is\quad to\quad plug\quad in\quad the\quad values,\quad another\quad is\quad to\quad realize\quad \\ that\quad as\quad the\quad numbers\quad get\quad bigger\quad they\quad get\quad less\quad further\quad apart.\quad For\quad example:\quad \sqrt { 2 } -\sqrt { 1 } >\sqrt { 3 } -\sqrt { 2 } .\\ With\quad that\quad in\quad mind,\quad \quad \sqrt { 2016 } -\sqrt { 2015 } \quad <\quad \sqrt { 2015 } -\sqrt { 2014 } \quad <\quad \sqrt { 2014 } -\sqrt { 2013 } \\ So,\quad \frac { \sqrt { 2016 } -\sqrt { 2015 } }{ \sqrt { 2014 } -\sqrt { 2013 } } <\frac { \sqrt { 2016 } -\sqrt { 2015 } }{ \sqrt { 2015 } -\sqrt { 2014 } } \quad becase\quad as\quad denominator\quad becomes\quad smaller\quad the\quad number\\ becomes\quad bigger\quad and\quad \frac { \sqrt { 2014 } -\sqrt { 2013 } }{ \sqrt { 2016 } -\sqrt { 2015 } } \quad is\quad the\quad only\quad number\quad greater\quad than\quad 1.\quad \\ So,\quad x\quad <\quad y\quad <\quad z

Super...Voted you up!

Krishna Ar - 6 years, 9 months ago

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