Problem to give solutions of the weekly challenged problems.

When I post a solution of a weekly challenged problem, I can not see my solution in the proper view. I post the solutions after writing them in 'LATEX'. But they come to me in plane text. How can I clarify my fault? Does anybody else also face such a problem or this problem is happening just with me? How should I write the solutions? Can the other users see my solutions in proper view?............. Please help me.....a link of my solution is....https://brilliant.org/assessment/s/algebra-and-number-theory/2937020/ ......you can check one of my written solution in 'LATEX' through this link.

Calvin: Type it as such $\frac{a}{b}$ .

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.

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Markdown	Appears as
`italics` or `_italics_`	italics
`bold` or `__bold__`	bold
- bulleted - list	bulleted list
1. numbered 2. list	numbered list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1 paragraph 2	paragraph 1 paragraph 2
`[example link](https://brilliant.org)`	example link
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# I indented these lines # 4 spaces, and now they show # up as a code block. print "hello world"	# I indented these lines # 4 spaces, and now they show # up as a code block. print "hello world"

Math	Appears as
Remember to wrap math in `$` ... `$` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$

Comments

Did you check out the Formatting guide, which is to the left of the Preview and Post buttons?

Tim Vermeulen - 7 years, 11 months ago

Yeah, I submit solutions through that 'Formatting guide'. That 'Formatting guide' is just a guide to write in 'LATEX'. I always follow that. Can you please go through the above link of my solution, to check if there is any problem of my solution writing? I am not understanding why this thing is happening!

Debjit Mandal - 7 years, 11 months ago

That link's not going to work for everyone (for instance: me). Try copying your solution and paste it as a comment on this thread.

Mursalin Habib - 7 years, 11 months ago

Recurrence Relation a{n} - a{n-1}=n(a{n-1} - a{n-2}), a{n-1} - a{n-2}=(n-1)(a{n-2} - a{n-3}), a{n-2} - a{n-3}=(n-2)(a{n-3} - a{n-4}), . . a{3} - a{2}=3(a{2} - a{1})=3(3-1)=3*2, a{2} - a{1}=3-1=2; So, we can easily find that, a{n} - a{n-1} = n!, a{n-1} - a{n-2}=(n-1)!, a{n-2} - a{n-3}=(n-2)!, . . a{3} - a{2}=3!, a{2} - a{1}=2!; By adding these (n-1) equations, all the a{i} 's will be canceled out, where i is a positive integer and 2 \leq i \leq (n-1). So, we shall get, a{n} - a{1} = \displaystyle \sum{j=2}^n j! \Rightarrow a{n}= \displaystyle \sum{j=1}^n j! [where a{1}=1, given]. Note that, 11 divides \displaystyle \sum{j=1}^10 j! and for all positive integer k \geq 11; 11 also divides k!. So, when n \geq 10, a{n} is divisible 11. So, for 10 \leq n \leq 1000, there are 991 such a{n}'s. Now we just need to find, how many a{n}'s are divisible by 11, for 1 \leq n \leq 9. It is very easy to calculate a{n}, where 1 \leq n \leq 9. Then, we shall find that only a{4} and a{8} are divisible by 11. So, the total number of such a_{n} is (991+2) = 993 [answer]

Debjit Mandal - 7 years, 10 months ago

@Debjit Mandal – Oh! You forgot to wrap your solution inside the "slash brackets". Try typing \ (2+3\ ) without the white-spaces in between the \ & the brackets. Then click on preview. You should see something like this:

$2+3$ .

Hope this helps!

Mursalin Habib - 7 years, 10 months ago

@Debjit Mandal – It's a very simple problem. You have just forgotten to put around your latex.

Bob Krueger - 7 years, 10 months ago

oh! Very very thanks. I got it. That helped me so much, Mursalin.

Debjit Mandal - 7 years, 10 months ago

You're welcome!

Mursalin Habib - 7 years, 10 months ago

How can I write a fraction in latex? Is it \frac {a}{b} ? But, this format does not show the fraction a/b. I got this text from the Formatting guide! What is the right format?......please help me.

Calvin: Type it as such $\frac{a}{b}$ .

Debjit Mandal - 7 years, 10 months ago

As several others have mentioned, you need to place your Latex code within \ ( \ ) (with the spaces removed. So, instead of \frac{a}{b}, it will appear as $\frac{ a} {b}$ .

I'd add a line to your comment and your post, so that you can view how to write it properly, by choosing the edit option to see what I typed.

Calvin Lin Staff - 7 years, 10 months ago

Thank you very much. I used \ ( \ ) (with the spaces removed) like '' $frac{a}{b}$ '' but not like $\frac{a}{b}$ . I shall try this in the solutions. THANKS.

Debjit Mandal - 7 years, 10 months ago

$2+3$

Sagnik Dutta - 7 years, 2 months ago

Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$