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An exam has (5) sections and each section has (2) optional questions. One question must be chosen from each section. How many ways are possible?

Answer and explanation

Correct answer: 32

There are 2 independent choices in each of the 5 sections. By the fundamental principle of counting, the total number of selections is \(2\times2\times2\times2\times2=2^5=32\). The value \(25\) would arise if there were 5 choices in each of 2 stages; here, each section has only 2 choices. Exam tip: multiply the number of choices when selections at successive stages are independent.

Related tags

Fundamental Counting PrinciplePermutations And CombinationsClass 11Product RuleCounting MethodsFundamental Principle Of CountingMathematicsClass 11 Mcq

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