Divisibility probability (a rhymed riddle)

Number Theory Level 2

Count by tens from 10 to 80. \text{Count by tens from 10 to 80.}

Pick any one of them - great!. \text{Pick any one of them - great!.}

Now what’s the probability \text{Now what's the probability}

It’s divisible by eight? \text{It's divisible by eight?}

1 2 \frac{1}{2} 1 3 \frac{1}{3} 1 4 \frac{1}{4} 1 8 \frac{1}{8}

David Stiff by David Stiff , 20, Canada

This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try refreshing the page, (b) enabling javascript if it is disabled on your browser and, finally, (c) loading the non-javascript version of this page . We're sorry about the hassle.

1 solution

David Stiff
Jun 11, 2018

If we begin to count by tens \text{If we begin to count by tens}

We’ll quickly start to see: \text{We'll quickly start to see:}

For every 4 there’s always 1 \text{For every 4 there's always 1}

Which fits 8 evenly! \text{Which fits 8 evenly!}

\text{}

10, 20, 30, 40 , 50, 60, 70, 80 \text{10, 20, 30,}~\textbf{40}\text{, 50, 60, 70,}~\textbf{80}

2 Helpful 0 Interesting 0 Brilliant 0 Confused

@David Stiff , This can qualify for my Math Poetry Contest!

Mohammad Farhat - 2 years, 7 months ago

Log in to reply

Thanks! I may write a better one to enter instead of this. I found your original contest note, so if I do come up with something I will duly enter!

David Stiff - 2 years, 7 months ago

1 pending report

Vote up reports you agree with

×

Problem Loading...

Note Loading...

Set Loading...