Not for the lazy

Number Theory Level 3

What is the unit digit of

( 5563527 ) 3 − ( 49121380 ) 3 (5563527) ^3-(49121380)^3

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7 3 5 1

Mr. India by Mr. India , 17, India

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1 solution

Mr. India
Apr 22, 2019

Unit digit of 1st number is 3

Of second number is 0

As 1st number is smaller than the second one, we will have to do 0 − 3 = 7 0-3=\boxed{7}

3 Helpful 0 Interesting 0 Brilliant 0 Confused

Only 17% correct! This has moved problem from easy to medium

Mr. India - 2 years, 1 month ago

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it is more of a trick question though

A Former Brilliant Member - 2 years, 1 month ago

I've missed the fact that the second number is bigger than the first one.So my digit was 3 − 0 = 3 3-0=3 . Damn, I have to read more carefully.

CodeCrafter 1 - 2 years, 1 month ago

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Ya that's the main reason for so low correct answers. I myself did the same mistake when I 1st did the question.(values were different)

Mr. India - 2 years, 1 month ago

Great question didn't notice that the first number was smaller than the second

Mahdi Raza - 1 year, 4 months ago

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