Can you tell me which answer is correct. the right or left one?

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?

Describe the relationship between the angles of similar triangles and the sides of similar triangles