Hello everyone,
I'm glad to find this forum. I'm studing IGCSE and I hope you guys can help me whenever I'm stuck in a question.
When asking to get the value n in. Venn diagram they answer is usually is to count the number and not to add them but in some other question i find the answer that by adding the numbers not counting them as I am used to which confuses me.
here is an example in the attached file asking for value n(A U B)
The correct answer is 21 . My answer is 3
How come he added them this when in other similar questions he just counted the numbers as I did?
Thank you very much in advance for your help.
I'm glad to find this forum. I'm studing IGCSE and I hope you guys can help me whenever I'm stuck in a question.
When asking to get the value n in. Venn diagram they answer is usually is to count the number and not to add them but in some other question i find the answer that by adding the numbers not counting them as I am used to which confuses me.
here is an example in the attached file asking for value n(A U B)
The correct answer is 21 . My answer is 3
How come he added them this when in other similar questions he just counted the numbers as I did?
Thank you very much in advance for your help.
Attachments

56.1 KB Views: 6