Grades 11-12 Video Solutions 2010-11&12 Video Solutions 2010 problem7

Video Transcription

Question number 7. Which of the following could be the number of edges of a prism?  So we have several numbers here, and what we have to remember, or what we should recall, that is the trick to solving this problem, is that in a prism, the number of edges is divisible by 3.  and what we also then have to remember is that the test for divisibility by 3 goes like this a number is divisible by 3 if the sum of its digits is divisible by 3  and so what we can do is look at each of our choices here and add up the digits so the sum of the digits here in A is 1 and B is 2 and C is 10 and D is 11 and  in E is 12 and of those numbers it's very easy to see that only 12 is divisible by 3 so that is a possibility for the number of edges in a prism 2010  you

Video Summary

Question number 7. Which of the following could be the number of edges of a prism? So we have several numbers here, and what we have to remember, or what we should recall, that is the trick to solving this problem, is that in a prism, the number of edges is divisible by 3. and what we also then have to remember is that the test for divisibility by 3 goes like this a number is divisible by 3 if the sum of its digits is divisible by 3 and so what we can do is look at each of our choices here and add up the digits so the sum of the digits here in A is 1 and B is 2 and C is 10 and D is 11 and in E is 12 and of those numbers it's very easy to see that only 12 is divisible by 3 so that is a possibility for the number of edges in a prism 2010 you

Keywords

prism

edges

divisibility

math problem

solution