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?

Excel in math and science

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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, interactive explorations.

Used and loved by over 5 million people

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

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

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