Grades 5-6 Video Solutions 2024-2024_5-6

Video Transcription

Video Summary

The Braille system uses a set of black and white dots to represent digits, and the task is to determine how many two-digit numbers can be formed with exactly five black dots. The numbers are grouped by their dot configurations. There are four cases to consider:<br /><br />1. One dot in tens place, four dots in ones place: 1 number.<br />2. Two dots in tens place, three dots in ones place: 16 numbers.<br />3. Three dots in tens place, two dots in ones place (excluding 0 in tens): 12 numbers.<br />4. Four dots in tens place, one dot in ones place: 1 number.<br /><br />Summing up gives a total of 30 different two-digit numbers.

Keywords

Braille system

two-digit numbers

black dots

dot configurations

mathematics