Count to 100. How many of those numbers are odd or multiples of 5? Since 50 are odd and 20 are multiples of 5, at first glance the answer is 70... See more

If \(A\) and \(B\) are two sets such that \[\lvert{A \cup B}\rvert=45, \lvert{A \cap B}\rvert=21 \text{ and } \lvert{A \setminus B}\rvert=11,\] then what is the value of \(\lvert{B}\rvert?\)

**Details and assumptions**

You may choose to read the summary page Set Notation.

Calvin has 23 books on his shelf, all of which are either Mathematics books or hardcover books. If 18 of them are hardcover books, and 12 of them are Mathematics books, how many hardcover Mathematics books does Calvin have on his shelf?

**Details and assumptions**

You may choose to read Principle of Inclusion and Exclusion.

If set \(A\) contains \(57\) elements, set \(B\) contains \(316\) elements and \(A \cap B\) contains \(15\) elements, how many elements are contained in \(A \cup B?\)

**Details and assumptions**

You may choose to read the summary page Set Notation.

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