The story of the letters and the boxes...

Discrete Mathematics Level 2

There are 3 letters and 4 letter boxes in an area. The number of ways of posting 3 letters if all the three letters are NOT posted in the same letter box is?

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100 Day Summer Challenge

The story of the letters and the boxes...

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Courses

Topics

Community

100 Day Summer Challenge

The story of the letters and the boxes...

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.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Master advanced concepts through explanations,
examples, and problems from the community.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.