examples, and problems from the community.

including olympiad champions, researchers, and professionals.

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

Seek simple and succinct solutions in these systems by sussing-out the significant symmetries.

\(\)

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Zandra Vinegar**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

When we write the integers from 1 to 100, how many times does the digit 9 appear?

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Dinesh Nath Goswami**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

Which of the following expresses the correct formula for the number of unit squares with exactly 1 red side in an \( n \times n \) square with \( n \geq 2 \) ?

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Arron Kau**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

Find the number of \(2\) digit numbers whose digit sum is a perfect square.

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Krishna Ar**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

If you take a \(3 \times 3 \times 3\) Rubik cube and break it up into the \( 3^3 \) cubes, how many cubes would have stickers on exactly \(2\) faces?

**Bonus question**: Can you generalize this for a \(N \times N \times N\) Rubik cube?

examples, and problems from the community.

including olympiad champions, researchers, and professionals.

Sign up to access problem solutions.

by
**
Chung Kevin**

Are you sure you want to view the solution?

Cancel
Yes I'm sure

×

Problem Loading...

Note Loading...

Set Loading...