16. You wish to proof the following by mathematical induction: n(n+1) 1+2+3++ n 2 An appropriate first step is to prove which of the following statements? A. 1+n-n+1) B. 1- n(n+1) O C. 1+2=1+n 1(1+1) D. 1- 2
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.
The first app of proof by mathematical induction is called the base step where we check if a given statement is valid for n equal to 1.
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