In honour of 2187

Algebra Level 1

( log 3 2187 0 ) ( log 3 2187 1 ) ( log 3 2187 2185 ) ( log 3 2187 2186 ) (\log_3 2187 - 0)(\log_3 2187 - 1)\cdot \cdot \cdot (\log_3 2187 - 2185)(\log_3 2187 - 2186)

Having solved 2187 Brilliant problems as of yesterday, I have decided to create an expression involving 2187 of the number 2187. Evaluate the expression above.


The answer is 0.

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3 solutions

Sarthak Rath
Apr 17, 2015

log 3 2187 \log_3 2187 can be written as :

log 3 3 7 \log_3 3^7

this is equal to:

7 7

putting 7 7 in place of log 3 2187 \log_3 2187 ,

( 7 0 ) ( 7 1 ) ( 7 2 ) . . . . ( 7 7 ) . . . . ( 7 2186 ) (7-0)(7-1)(7-2)....(7-7)....(7-2186)

since 7 7 = 0 , 7-7 = 0,

the whole expression becomes z e r o \boxed{zero} .(required answer)

Moderator note:

Yes correct. Zero Product Property is the key to this problem.

nice its same as mine

Mayank Raj - 6 years, 1 month ago

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yep... thats what i said...

Sarthak Rath - 6 years, 1 month ago
Mayank Raj
Apr 17, 2015

In The problem ( log 3 2187 0 ) ( log 3 2187 1 ) ( log 3 2187 2185 ) ( log 3 2187 2186 ) (\log_3 2187-0)(\log_3 2187-1)\cdot \cdot \cdot (\log_3 2187-2185)(\log_3 2187-2186) There may be one bracket of ( log 3 2187 7 ) (\log_3 2187-7) = ( log 3 2187 log 3 3 7 ) =(\log_3 2187-\log_3 3^{7}) = ( log 3 2187 log 3 2187 ) =(\log_3 2187-\log_3 2187) = 0 =0 Therefore by zero product property the value of the expression is = 0 \boxed{=0}

Moderator note:

Great job!

just 3 mins gap! guess when i was about to finish, u did! anyway, from where did u learn all that computer science? also, when is fiitjee starting?

Sarthak Rath - 6 years, 1 month ago

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I have asked the bhilai centre it says between 20and 25 th of april

Mayank Raj - 6 years, 1 month ago

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in other centres, it has already started and they have got the packages... from 6th onwards at many centres...kolkata, patna and from 26th march at delhi

Sarthak Rath - 6 years, 1 month ago

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@Sarthak Rath I think that is our misfortune

Mayank Raj - 6 years, 1 month ago

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@Mayank Raj i guess that our batch will speed up after the great split! also, who is the sponcer of your vast computer knowledge? lvl 5?

Sarthak Rath - 6 years, 1 month ago

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@Sarthak Rath And in case of computer science I used java to solve level 4 problems

Mayank Raj - 6 years, 1 month ago

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@Mayank Raj and that is the only way

Mayank Raj - 6 years, 1 month ago

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@Mayank Raj how to use java here????

Sarthak Rath - 6 years, 1 month ago

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@Sarthak Rath I have learned in my school some conditional statements in java which helped me a lot in solving the problems

Mayank Raj - 6 years, 1 month ago
Sar Sarique
Apr 17, 2015

log(2187-2186) = log1 = O

Moderator note:

Your solution has been marked wrong. log a b c log a ( b c ) \log_a b - c \not = \log_a (b-c) .

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