Compute the following numbers:b. How many three-letter “words” are there without repeated letters? (so no “BBA”)
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.
Compute the following numbers:
b. How many three-letter “words” are there without repeated letters? (so no “BBA”)
The total alphabets are 26.
The first number can be filled with 26 possibilities since total alphabets are 26.
It is given that letters cannot be repeated. Therefore, the second number can be filled with the remaining 25 possibilities. Similarly, the third number can be filled with the remaining 24 possibilities.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 1 images
