A box contains 16 computer disks, 4 of which are known to have bad sectors. In how many ways can 3 disks be selected, without replacement and without regard to order, so that the following conditions are satisfed? In how many ways can disks be selected so that none have bad sectors? 220 In how many ways can disks be selected so that all have bad sectors? how many ways can disks be selected so all have bad sectors,
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.
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