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# Weekend Wiki Party 9 - Empty Pages

This week, we're trying something a little different with the Weekend Wiki Party, and there should be something here for everyone. Below, you'll find the most visted pages in each topic on Brilliant that currently have no content.

These pages are about things that people on Brilliant want to know about, but there's currently nothing on our wiki to help them. Can you help them out by adding to these pages?

Simple Sequences

Absolute Value

### Combinatorics

Dilworth’s Theorem

Perfect Numbers

Input Output

### Physics

Leave a comment if you make an edit, and thanks for helping make Brilliant the best place in the world to learn math and science!

Note by Calvin Lin
1 year, 5 months ago

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@Calvin Lin Sir, I contributed to the "Absolute Value" Wiki.I added examples to each section , improved the definition and added some properties to the notes of absolute value.Hope you like it :) · 1 year, 5 months ago

Thanks! That page is beginning to look better :) Staff · 1 year, 5 months ago

Sir, i've contributed to the graphs of inverse trigo. can u check it?? · 1 year, 5 months ago

Edited out/Cleaned up $$\text{Perfect Numbers } \ddot\smile$$ · 1 year, 5 months ago

Oh yay! That page looks much better than it did the day before.

It could benefit from adding some proofs, or combining the list of properties which are mostly "it has the form $$2^{n-1} ( 2^n - 1 )$$. Staff · 1 year, 5 months ago

Is it okay, if I help with these pages after JEE, that is, next week? I am saving this note so that I can remember to do so. · 1 year, 5 months ago

Certainly! Help at any point in time will be welcome.

All the best with JEE! Staff · 1 year, 5 months ago

Thank you sir! · 1 year, 5 months ago

A stopwatch has a least count of 0.1 seconds it does 20 oscillations in 25 seconds find error in time period · 1 year, 5 months ago

0.125secs? · 1 year, 5 months ago

In response to ayanlaja answer, please can you tell how the answer came · 1 year, 5 months ago

I think.....Period(T)=Time Taken/Number of oscilations.......T=25/20.....T=1.25 secs.....Since the stopwatch moves @least 0.1secs which is its reading accuracy....Error=1.25*0.1=0.125secs · 1 year, 5 months ago