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Try solving a similar but simpler problem. If the test had only one question, the answer could be either true or false. Therefore, there would be 2 ways to answer.

          Try solving a similar but simpler problem. If the test had only one question, the answer could be either true or false. Therefore, there would be 2 ways to answer.
        

Added by Shane R.

Grade 6 Mathematics: Open Up Resources, Common Core State Standards Edition
Grade 6 Mathematics: Open Up Resources, Common Core State Standards Edition
N/A 6th Edition
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Try solving a similar but simpler problem. If the test had only one question, the answer could be either true or false. Therefore, there would be 2 ways to answer.
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Transcript

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00:01 In this problem, we are given that there is a test, and this consists of 10 questions which are true or false questions.
00:11 And we are required to find the number of ways in which all the questions can be answered differently.
00:18 So let's say, and here is the number of ways which we have to figure out, and we see that.
00:23 To answer one question, we have two distinct ways, because we can either select true, are false.
00:32 So we have 10 different questions and to answer each one of them we will have two ways...
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