N = m = 0 ∑ 2 2 5 − 1 ⎝ ⎜ ⎜ ⎜ ⎜ ⎜ ⎜ ⎛ n = 1 ∏ 5 ( 2 n m + 2 + 2 n m ) 1 + 1 ⎠ ⎟ ⎟ ⎟ ⎟ ⎟ ⎟ ⎞
lo g 2 ( lo g 2 ( ( N − 1 ) 2 5 − 1 ) ) + 4 = ?
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C RAZY F ANCY L ATEX ( + 1 ) I loved solving this problem ⌣ ¨ !I was eager to write a solution for it as well.You beat me :(
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T H A N K S !
Haha... I also think the same after solving your questions.. But like you I also make sure that I'm the first to post a solution to my question... :-)
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It's obviously a problem poser's 'right' to show off his mathematical creativity :)
The answer is easily guessable.(do you see why? :P :P)
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@Nihar Mahajan – Obviously not :P otherwise I would have modified it... :\ but I tried my best to make the problem guess proof.. Maybe I would have made it decimal type..
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@Rishabh Jain – Intuitively, you can see the expression as lo g 2 ( lo g 2 ( ( s o m e t h i n g ) 2 5 ) ) ) = 5 and the rest follows XD
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@Nihar Mahajan – Really?? :-) ... Did you applied the same theorem to solve the question?? :-D
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@Rishabh Jain – Yes. I call it "Axiom of Guessology" LOL!
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@Nihar Mahajan – Yeah and you deserve a g u e s s o s c a r for that.... But I don't know who will present it to you.. Lol :/
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@Rishabh Jain – Ok, here's a fun problem . :P
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@Nihar Mahajan – Already done... Habort has already posted a solution... Lol ...you should greet him ..
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@Rishabh Jain – I only told him to post a solution Or I would have posted it :P
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Inspiration n = 1 ∏ 5 ( 2 n m + 2 + 2 n m ) 1 = ( n = 1 ∏ 4 ( 2 n m + 2 + 2 n m ) ) ( 2 4 m + 2 − 2 4 m ) ( ( 2 5 m + 2 + 2 5 m ) ( 2 5 m + 2 − 2 5 m ) ) ( 2 5 m + 2 − 2 5 m ) Using ( a + b ) ( a − b ) = a 2 − b 2 repeatedly we get: N = n = 0 ∑ 2 2 5 − 1 ( 2 5 m + 2 − 2 5 m ) ( A T e l e s c o p i c S e r i e s ) = − 0 − 1 + 2 5 2 2 5 + 2 5 2 2 5 + 1 = 1 + 2 5 2 2 5 + 1 lo g 2 ( lo g 2 ( ( N − 1 ) 2 5 − 1 ) ) + 4 = lo g 2 ( lo g 2 ( 2 2 5 ) ) + 4 = 5 + 4 = 9