Adding numbers

Discrete Mathematics Level 2

There are 40 numbers on the blackboard from 1 to 40.we are selecting the two numbers a,b randomly and placing a new number a + b - 1 on deleting both numbers a and b.Find the last number left on the blackboard.

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Adding numbers

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Courses

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Community

100 Day Summer Challenge

Adding numbers

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.