- #1
mishima
- 561
- 34
Homework Statement
If a test consists of 15 true false questions, in how many ways can a student mark his paper if:
a) he answers each question
b) he leaves anyone question unanswered.
Homework Equations
Multiplication of choices
The Attempt at a Solution
a) 2^15 Correct.
b) 3*(2^14) Incorrect. (right answer = 245,760)
One question has 3 choices, the rest have 2?