13) A drumline in formation has the following members in each row. First row: 2 members Second row: 4 members Third row: 8 members And so on. Assuming the drumline has seven rows, there are a total of A) 62 B) 64 C) 126 D 128 members in the first five rows. Also, the drumline has a total of A) 254 B) 256 C) 510 D) 520
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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