This discussion board is a place to discuss our Daily Challenges and the math and science
related to those challenges. Explanations are more than just a solution — they should
explain the steps and thinking strategies that you used to obtain the solution. Comments
should further the discussion of math and science.

When posting on Brilliant:

Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .

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Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.

Stay on topic — we're all here to learn more about math and science, not to hear about your favorite get-rich-quick scheme or current world events.

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Easy Math Editor

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

`*italics*`

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boldNote: you must add a full line of space before and after lists for them to show up correctlyparagraph 1

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`\sum_{i=1}^3`

`\sin \theta`

`\boxed{123}`

## Comments

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TopNewestYou can Buy david burton's number theory book and arthur engel's problem solving strategies

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although quite expensive they are , but best books!

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This one i did :)

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did u get 47?

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Yep!

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@Md Zuhair @Vilakshan Gupta Guys , i just wanna ask that how can I improve my Number Theory and Geometry (particularly) skills?

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I struggled very much in Geometry!

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u will not get Arthur engel's in any shop. U can download its pdf and print it or simply read it.

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@Vilakshan Gupta Thank you so much... I'll surely get those!

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