38.A question paper has 5 multiple choice questions and 5 true or false questions. Each multiple choice question is provided with 3 choices. Find the number of ways that an examinee can attempt one or more questions of the given 10 questions.
(1)310 (2)65-1
(3) 85 -1 (4) 125 -1
Answer:
Number of ways of dealing with each multiple choice question = 4(3 ways of attempting and one way of not attempting)
Number of ways of dealing with each true or false question = 3 (2 ways of attempting and one way of not attempting)
Therefore Number of ways of attempting one or more questions = (45 × 35) – 1 = 125 – 1
