Grades 11-12 Video Solutions 2011-11&12 Video Solutions 2011 problem9

11&12 Video Solutions 2011 problem9

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Video Summary

Damien wrote all odd numbers from 1 to 2011 on the chalkboard, totaling 1006 numbers. Kosma erased those divisible by 3. The divisible sequence follows the form \(6n - 3\), resulting in 335 numbers being erased. Subtracting these gives 671 numbers remaining on the chalkboard. The final answer is 671 numbers.