There are two different Geography books, five different Natural Sciences books, three different History books and four differe Mathematics boos on a shelf. In how many different ways can they be arranged if all the books of the same subjects stand together? 14! A 21+51+31+41 141 B 21 x 51 x 31x 41 2! x 5! x 3! x 4! x 4! 21 +5!+3!+4!
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.
There are two different Geography books, five different Natural Sciences books, three different History books and four different Mathematics boos on a shelf. In how many different ways can they be arranged if all the books of the same subjects stand together?
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