In Morse code, symbols are represented by variable-length sequences of dots and dashes. (For example, A = ·—, 1 = · — — — —, ? = ·· — —··.) How many different symbols can be represented by sequences of six or fewer dots and dashes?

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…

The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.