Q: each question on a 10-question multiple choice test has four possible answers.

Question

1.Each question on a 10-question

multiple choice test has four possible

answers. In how many ways could the

questions be answered if

b) the student is permitted to leave

answers blank? <- wouldn't it be 4,3,2,1,0,..... I don't understand why it is 5,5,5, or 5¹⁰ Please explain

Answer 1

"four possible answers" may be answered in 5 possible ways: a, b, c, d, blank

Answer 2

Draw a tree to see why it is 5¹⁰.