Do You Like Powers?

Algebra Level 2

A = 2 5555 , B = 3 3333 , C = 6 2222 \large A = 2^{5555}, \qquad B = 3^{3333}, \qquad C = 6^{2222}

What is the order of these numbers from smallest to largest?

C < B < A C<B<A A < B < C A<B<C A < C < B A<C<B B < A < C B<A<C

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12 solutions

Aman Baser
Aug 15, 2015

2 5555 = 3 2 1111 2^{5555} = 32^{1111}
3 3333 = 2 7 1111 3^{3333} = 27^{1111}
6 2222 = 3 6 1111 6^{2222} = 36^{1111}

Since 27 < 32 < 36 27 < 32 < 36 , the required order of the three numbers is

3 3333 { 3 }^{ 3333 } , 2 5555 { 2 }^{ 5555 } , 6 2222 { 6 }^{ 2222 }

the last number was presented as 6^2

A Former Brilliant Member - 5 years, 2 months ago

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just scroll the tab to the left... I had the same problem. Annoying

Michele Martignago - 5 years, 1 month ago

I have the right answer, but...You know how your mouse pad starts freaking out because it gets wet? Never do math problems while eating grease food. Your mouse pad might screw you over. Hate my life.

Robert Vasquez - 5 years, 1 month ago

A = ( 2 5 ) 1111 , B = ( 3 3 ) 1111 , C = ( 6 2 ) 1111 2 5 = 32 , 3 3 = 27 , 6 2 = 36. B < A < C . \Large A=(2^5)^{1111}, ~~B=(3^3)^{1111},~~C=(6^2)^{1111}\\ 2^5=32,~~3^3=27, 6^2=36.\\ \therefore~~B<A<C.

Did the same way

aditya kumar - 5 years, 10 months ago

Easiest explaination.

Đức Bảo Nguyễn - 5 years, 9 months ago

wow! really excellent solution

amit bera - 5 years, 2 months ago

Fine solution.....

Shahriar Rizvi - 4 years, 3 months ago
Satyajit Mohanty
Aug 15, 2015

In this entire solution, all the log \log functions are in base-10.

We know that log ( 2 ) = 0.301 , log ( 3 ) = 0.477 \log(2) = 0.301 , \log(3) = 0.477 .

log ( A ) = 5555 log ( 2 ) = 5555 × 0.301 1672.2 \log(A) = 5555 \log(2) = 5555 \times 0.301 \approx 1672.2

log ( B ) = 3333 log ( 3 ) = 3333 × 0.477 1590.2 \log(B) = 3333 \log(3) = 3333 \times 0.477 \approx 1590.2

log ( C ) = 2222 log ( 6 ) = 2222 ( log ( 2 ) + log ( 3 ) ) = 2222 ( 0.301 + 0.477 ) 1729.1 \log(C) = 2222 \log(6) = 2222( \log(2) + \log(3) ) = 2222(0.301+0.477) \approx 1729.1

Since we can see that log ( C ) > log ( A ) > log ( B ) \log(C) > \log(A) > \log(B) and since A , B , C > 0 A,B,C > 0 , we conclude that C > A > B C>A>B .

did the same way, logarithms make the things so easy

Gokul Kumar - 5 years, 9 months ago

I've used logarithms too!

Victor Paes Plinio - 5 years, 10 months ago

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<h1wafa abas</h1>

Wafa Abbas - 1 year, 10 months ago
Dev Sharma
Aug 15, 2015

A has 1673 digits.

B has 1591 digits.

C has 1730 digits.

Clearly C>A>B

what math did you use to get the digits ? I wonder how you do it,

Đức Bảo Nguyễn - 5 years, 9 months ago

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using logarithm.. for example 2^x has X lo2+1 no of digits. here we take log to base 10. for example 2^10 has 10 log2 to base 10+1 digits= 10*.3010+1= 4. we take only the integer part of the product. hope its clear!

Nithin Nithu - 5 years, 6 months ago

It would be better at this level to explain how you get the digits. However I like your approach, though it may not work always.

Niranjan Khanderia - 5 years, 10 months ago

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Using logarithm, i found the number of digits as, log2^5555 + 1 and two others

Dev Sharma - 5 years, 10 months ago

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Thank you.

Niranjan Khanderia - 5 years, 10 months ago

How can I find the No. of digits??? Please explain me...

Chinmoyranjan Giri - 5 years, 10 months ago

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just take log base 10 and add 1

Dev Sharma - 5 years, 10 months ago

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is it always correct?

Parinya Wongpanya - 5 years, 4 months ago

hw did u find out the digits?

Vignesh Waran - 5 years, 9 months ago

hw did u find out the digits?

Vignesh Waran - 5 years, 9 months ago

How to find no of digits

Manish Kumat - 5 years, 9 months ago

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using logarithm.. for example 2^x has X lo2+1 no of digits. here we take log to base 10. for example 2^10 has 10 log2 to base 10+1 digits= 10*.3010+1= 4. we take only the integer part of the product. hope its clear!

Nithin Nithu - 5 years, 6 months ago

dev, how did you calculate the number of digits?

juby babu - 5 years, 9 months ago

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using logarithm.. for example 2^x has X lo2+1 no of digits. here we take log to base 10. for example 2^10 has 10 log2 to base 10+1 digits= 10*.3010+1= 4. we take only the integer part of the product. hope its clear!

Nithin Nithu - 5 years, 6 months ago

how to calculate the number of digits?

juby babu - 5 years, 9 months ago

Sadasiva Panicker
Oct 29, 2015

2^5 = 32; 3^3= 27; 6^2 = 36; 27 < 32< 36 So, B<A<C.

Supawat Pugkhem
Jan 20, 2016

The screen capture is only 6^2

That's why I put C<B<A and it's not correct ;-; I was like "what"?

Tri Bui - 5 years, 2 months ago
Kabir Iu
Aug 28, 2015

First we can consider only one digit of power. Then calculate, 2^5=32; 3^3=27; 6^2=36.So B<A<C.

B Mohan Rao
Aug 22, 2015

it's some what logical question: 2^5= 32 ; 3^3= 27 ; 6^2=36

Krishna Garg
Aug 22, 2015

We can simply look for assessment of A=3^2 ,B=3^3. c=6^2 that give us clue that C is lowest,A is more tha C and B is biggest ,therefore B <A<C

Jovie Fabrique
Aug 17, 2015

2^(5)1111 3^(3)1111 & 6^(2)*1111 Therefore, 32^1111 27^1111 36^1111 ,i jus focused on thr values of base,i don't mind the exponents coz they are just similar :D

exponents are just s a m e \color{#D61F06}{same } not only similar.

Niranjan Khanderia - 5 years, 10 months ago
Brijesh Nair
Aug 17, 2015

Bring all the number to the power of 1111 and then compare .

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