Posted by **Randy** on Wednesday, May 23, 2012 at 5:51pm.

A history teacher gives a 20 question T-F exam. In how many different ways can the test be answered if the possible answers are T or F, or possibly to leave the answer blank?

- ALGEBRA -
**MIKE**, Wednesday, May 23, 2012 at 6:00pm
I THINK 60 (not sure)

- ALGEBRA -
**Steve**, Wednesday, May 23, 2012 at 6:36pm
2 choices for each answer gives 2^20 = 1,048,576

including blanks, that's 3 choices for each question, or 3^20 = 3,486,784,401

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