Question

You have 3 multiple choice questions left on a test. Each question has 4 options (A, B, C, D). In how many ways could you answer the last 3 questions on your test?

Answer 1

45 from 3 questions

3 x 15 = 45 answers

Shown below for one question then all you need to do is multiply them all by 3 as in (15 x 3)

A

B

C

D

AB

AC

AD

BC

BD

CD

ABC

ACD

ABD

BCD

ABCD

This gives a probability that some one who dont know how many to answer in one question gets 1/45 probability they will get the right answer.