# Is my maths answer correct (venn diagrams)

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#1
I've posted the image below
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#2
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3 weeks ago
#3
For (a), you should give the total of values in the various included subregions.
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#4
(Original post by DFranklin)
For (a), you should give the total of values in the various included subregions.
3 & 2?
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3 weeks ago
#5
4 and 8 are the numbers of elements, so you need to calculate the total.
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#6
H

(Original post by the bear)
4 and 8 are the numbers of elements, so you need to calculate the total.
How do I do that? Please could you explain?
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3 weeks ago
#7
(Original post by noodlestopshop)
H

How do I do that? Please could you explain?
i cannot give a complete explanation... it is against the rules.

you 4 items in one section, and 8 in another... and you need to find the total of the items. see how you get on.
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#8
(Original post by the bear)
i cannot give a complete explanation... it is against the rules.

you 4 items in one section, and 8 in another... and you need to find the total of the items. see how you get on.
12?
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3 weeks ago
#9
(Original post by noodlestopshop)
12?
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#10
(Original post by the bear)
Is my answer to (b) correct?
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3 weeks ago
#11
(Original post by noodlestopshop)
Is my answer to (b) correct?
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#12
(Original post by the bear)
is there any chance you could tell me if these are incorrect? I think they are, but I'm unsure
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3 weeks ago
#13
The 32 is wrong in the venn diagram.
b) (ii) is wrong.

If you want help on why, it would be good if you could explain how you got those (incorrect) answers.
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#14
(Original post by DFranklin)
The 32 is wrong in the venn diagram.
b) (ii) is wrong.

If you want help on why, it would be good if you could explain how you got those (incorrect) answers.
Would it be 36 instead of 32?

And Is (i) correct?

For (ii) the u sign means things in A AND B but since there is a ‘ it means not in B so what I thought was - Things in A and not in B so I took 1 and my answer for (ii) was 1 if that makes sense
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3 weeks ago
#15
(Original post by noodlestopshop)
Would it be 36 instead of 32?

And Is (i) correct?

For (ii) the u sign means things in A AND B but since there is a ‘ it means not in B so what I thought was - Things in A and not in B so I took 1 and my answer for (ii) was 1 if that makes sense
36 is not correct. Again, please explain how you're getting this answer.

For (ii) X u Y is the set of things that are either in X OR Y (or both).
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#16
(Original post by DFranklin)
36 is not correct. Again, please explain how you're getting this answer.

For (ii) X u Y is the set of things that are either in X OR Y (or both).
For 36 I did 5+9=14 50-14=36
and for (ii) There is a symbol (') next to the B which stands for 'Not In' so does that not matter in this question?
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3 weeks ago
#17
(Original post by noodlestopshop)
For 36 I did 5+9=14 50-14=36
and for (ii) There is a symbol (' next to the B which stands for 'Not In' so does that not matter in this question?
The total of the numbers in each section of the diagram have to add up to the size of the universal set (50).

For the last bit, you want the number of items that are "in A OR (not in B)".
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#18
(Original post by DFranklin)
The total of the numbers in each section of the diagram have to add up to the size of the universal set (50).

For the last bit, you want the number of items that are "in A OR (not in B)".
So for A would it be 40?
and for (ii) would it be 1 and 40 so 41?
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3 weeks ago
#19
Yes.
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#20
(Original post by DFranklin)
Yes.
Do I write 40, 1 or 41?
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