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What is the remainder when 90627115901671 is divided by 3?


The answer is 1.

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4 solutions

Md Omur Faruque
Aug 8, 2015

If anyone knows even slightly about remainder, his chance of answering this question correctly will be 100 % 100\% . Only three possible options of remainder: 0 , 1 0,1 & 2 2 . And guess what? You have three chances. It would have been better if the question was posted with multiple choice option. However, here we go:

The divisibility rule of 3 is, "If we add the digits of the dividend to get \color{#0C6AC7} {\text{The divisibility rule of 3 is, "If we add the digits of the dividend to get}} a new number & divide it by 3, the remainder will still be the same." \color{#0C6AC7} {\text{a new number \& divide it by 3, the remainder will still be the same." }}

9 + 0 + 6 + 2 + 7 + 1 + 1 + 5 + 9 + 0 + 1 + 6 + 7 + 1 = 55 1 ( m o d 3 ) {9+0+6+2+7+1+1+5+9+0+1+6+7+1=55\, \equiv 1\pmod3} 5 + 5 = 10 1 ( m o d 3 ) {\Rightarrow 5+5=10 \,\equiv 1\pmod3} 1 + 0 = 1 1 ( m o d 3 ) {\Rightarrow 1+0=1 \, \equiv 1\pmod3}

We can get the answer directly from the first line as remainder of 55 55 is 1 1 , when divided by 3 3 . Whatsoever, following the divisibility rule of 3 3 , we get the remainder 1 \color{#69047E} {\boxed 1} .

However I am too merciful.

Swapnil Maiti - 5 years, 10 months ago

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I hope you can always be merciful like this 😉

MD Omur Faruque - 5 years, 10 months ago

I need some mental calculations in here :)

First, we add the digits together:

9 + 0 + 6 + 2 + 7 + 1 + 1 + 5 + 9 + 0 + 1 + 6 + 7 + 1 = 55 9+0+6+2+7+1+1+5+9+0+1+6+7+1 = 55

Then, 5 + 5 = 10 5+5 =10

Then, 1 + 0 = 1 1+0 = 1 . Thus, this number is not divisible by 3 3 . Divide 1 1 by 3 3 we get 1 \boxed{1}

Anik Mandal
Aug 8, 2015

It's either 0 , 1 0,1 or 2 2 ... Easiest way check the three you will get it(only for those lazy like me)

I too thought of it pal......... but tell me the way....... next time i will give the divisor as 5.

Swapnil Maiti - 5 years, 10 months ago

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Come on hangouts..!

Anik Mandal - 5 years, 10 months ago

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yeah let's do it :)

Swapnil Maiti - 5 years, 10 months ago
Simon Nunayon
Aug 20, 2015

If you make each digit add up to a multiple of three, you can whether or not it will have a remainder without add them all up. And since one is left over, it means that the remainder would be one as the number would be a multiple of 3 without it

Note to writer: since you have three tries and the remainder after dividing by three is either 0,1 or 2, anyone can guess multiple times and get it right

Adrian Ma - 2 years, 3 months ago

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