## Excel in math and science

### Master concepts by solving fun, challenging problems.

## It's hard to learn from lectures and videos

### Learn more effectively through short, conceptual quizzes.

## Our wiki is made for math and science

###
Master advanced concepts through explanations,

examples, and problems from the community.

## Used and loved by 4 million people

###
Learn from a vibrant community of students and enthusiasts,

including olympiad champions, researchers, and professionals.

## Comments

Sort by:

TopNewest@Calvin Lin Please help me out!

I was reading the wiki On AM - GM Inequality .In it I found out that there was a proof which said that it requires a bit of combinatorics . In the last bit of the proof , it said

\(k > m_g > 0 \Rightarrow m_g \in {(0 , k)}\)

\(k \geq m_a > 0 \Rightarrow m_a \in {(0 , k]}\).

From these how does it follow that \(m_a \geq m_g\) ? – Ankit Kumar Jain · 1 day ago

Log in to reply

@Calvin Lin Sir , recently I posted two questions ..the problem name changed automatically.

Like I named the problem 'Strange' , it changed to 'A geometry problem by Ankit Kumar Jain. – Ankit Kumar Jain · 3 days, 16 hours ago

Log in to reply

– Calvin Lin Staff · 3 days, 12 hours ago

We remove titles that are meaningless to the problem.Log in to reply

Sir , can you please suggest some name for the problem I mentioned above so that I can get some idea and I can try to give names that are meaningful from next time. – Ankit Kumar Jain · 3 days, 1 hour ago

Log in to reply

Sir, So will you write the feedback on the solution or is the feature removed? – Ankit Kumar Jain · 1 week, 5 days ago

Log in to reply

– Calvin Lin Staff · 1 week, 5 days ago

The functionality of "request feedback from challenge master" has been removed.Log in to reply

We have removed that functionality. – Calvin Lin Staff · 1 week, 6 days ago

Log in to reply