how to interpret multiple venn diagram

Question

Could some one explain the logic behind multiple Venn diagram by explaining what these numbers represent in the picture. Thanx in advance.

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technically not *completely* on-topic here; you might have better luck at http://math.stackexchange.com — Justin L., Jul 22 '13 at 10:05

score 0 · Accepted Answer · answered Jul 22 '13 at 10:08

The number in each location represents the number of items that can only be there and nowhere else.

For example there is exactly one item that is both S and r and also not in E or R.

There are two items that are in S, r, and E and not in R.

There are three items that are in E and r and also not in S or R.

Four items in only r and nowhere else

etc.

Conveniently enough, because all of the categories are mutually exclusive, you can find the number of items in any arbitrary category by adding up the sub-categories that make it up.

For example, the number of items in S and r total are 1+9+2+8 = 20

how to interpret multiple venn diagram

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