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Question

There are 6 multiple choice questions in examination. How many sequences of lswers are possible, if the first three questions have 4 choices each and the next three have 2 each ? 


Solution

Each one of the first three questions can be answered in 4 ways. The total number of ways to answered the first three question = 4×4×4=64 Each of the next three question can be answered in 2 ways. 
The total number of ways the answered the next three questions = 2×2×2=8 so, total number of sequences at answers 64×8=512


Mathematics
RD Sharma
Standard XI

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