Grades 9-10 Video Solutions 2014-Levels 9&10 Video Solutions 2014 problem28

Levels 9&10 Video Solutions 2014 problem28

Video Transcription

Video Summary

The problem involves finding the last number in the first half of a list of all possible seven-digit numbers created from the digits 1 to 7, arranged in increasing order. The smallest is 1234567, and the largest is 7654321. To find the middle, you assess which configurations align closely with the numerical average. By eliminating impossible options based on the rules and average comparison, the closest and largest option for the first half ending is 4376521. Thus, the last number of the first half of the list is 4376521, which corresponds to option E.

Keywords

seven-digit numbers

digits 1 to 7

increasing order

first half

last number