Romeo and Juliet   Here is a list of the main characters in Shakespeare's Romeo and Juliet. The first seven characters are male and the last four are female. Escalus, prince of Verona Paris, kinsman to the prince Romeo, of Montague Household Mercutio, friend of Romeo Benvolio, friend of Romeo Tybalt, nephew to Lady Capulet Friar Lawrence, a Franciscan Lady Montague, of Montague Household Lady Capulet, of Capulet Household Juliet, of Capulet Household Juliet's Nurse A total of 15 male and 10 female actors are available to play these roles. How many possible casts are there? (All roles are to be played by actors of the same gender as the character.) __________ casts

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Permutations and Combinations

If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.

Counting Theory

The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.