SOLUTION: A true-false test contains 21 questions. In how many different ways can the 21-question test be answered?

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Question 354634: A true-false test contains 21 questions. In how many different ways can the 21-question test be answered?
Answer by sudhanshu_kmr(1152) About Me  (Show Source):
You can put this solution on YOUR website!

Each question can be answered by 2 ways...
so, total no. of ways = 2*2*..........21 times

= ( 2 )^21