Two standard six-sided dice, one red and one blue, are rolled. How many different rolls are there in which at least one dice shows a ?
If and are two sets such that then what is the value of
Details and assumptions
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Calvin has 23 books on his shelf, all of which are either Mathematics books or hardcover books. If 18 of the 23 are hardcover books, and 12 of the 23 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 contains elements, set contains elements and contains elements, how many elements are contained in
Details and assumptions
You may choose to read the summary page Set Notation.
In a group of students, are taking physics and are taking chemistry. If is the number of students taking both physics and chemistry, then the possible range of is What is