A true-false test has 12 questions. What is the probability of guessing the correct answers to all of the questions?
Choices:
A - 1/4096
B - 1/144
C - 1/24
D - 1/14
I choose C because 12 * 2 = 24 = 1/24
The correct answer is A - 1/4096
How do you get that?

Question

A true-false test has 12 questions.  What is the probability of guessing the correct answers to all of the questions?
Choices:
A - 1/4096
B - 1/144
C - 1/24
D - 1/14
I choose C because 12 * 2 = 24 = 1/24
The correct answer is A - 1/4096
How do you get that?

anonymous · Answer

(1/2)^12  = 1/4096

like flipping a coin 12 times and getting heads each time

shiree19 · Answer

I still don't understand.  What does ^12 mean?
Do I do 1 / 2 = 0.5

anonymous · Answer

a^12 = a x a x a...twelve times, a to the 12th power

shiree19 · Answer

ok.  a = 2.  I get it now.  Thanks so much!
2^12 = 4096 = 1/4096

anonymous · Answer

Very good!