## 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:

TopNewestBoth are true. It just depends what base you're in.

Log in to reply

correct.

Log in to reply

The first equation is true in base 2 ( binary ) ,the second in base 10 ( decimal ).

Log in to reply

good man. excellent.

Log in to reply