An eight digit number is such that it contains two 1's, two 2's, two 3's and two 4's arranged in such a way that there is one number between the two 1's, two numbers between the two 2's, three numbers between the two 3's and four numbers between the two 4's. What is the number?

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.

Your answer seems reasonable.
Find out if you're right!