Grades 11-12 Video Solutions 2012-2012_11-12

Video Transcription

The sum of the digits of a nine-digit integer is eight. What is the product of these digits?  So we have nine digits to work with. If all of them were positive, then the sum would be at least nine. That means one of the digits is zero, and so the product has to be zero.

Video Summary

The sum of the digits of a nine-digit integer is eight. What is the product of these digits? So we have nine digits to work with. If all of them were positive, then the sum would be at least nine. That means one of the digits is zero, and so the product has to be zero.