Determine whether the following problem involves a permutation or a combination. Explain your reasoning. How many different 5-letter passwords can be formed from the letters S, T, U, W, X, Y, and Z if no repetition of letters is allowed

The moats separating people from the animals are 5 m wide for lions and 4 m wide for the elephants. if the lion’s moat is 4 m deep, how deep should the elephants’ moat be?

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?

The average length of a king cobra is 3.7 m. the record length is 1.88 m longer than the average. how long is the record holder?