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What is the total number of ways to choose (0) gifts or (1) gift from (10) different gifts?

Answer and explanation

Correct answer: 11

There is exactly 1 way to choose 0 gifts: choose none. There are \(\binom{10}{1}=10\) ways to choose 1 gift. Hence, the total is \(\binom{10}{0}+\binom{10}{1}=1+10=11\). Choosing 10 alone is incorrect because it omits the one way of choosing no gift. Exam tip: Add the counts for mutually exclusive selection cases joined by “or.”

Related tags

CombinationsBinomial CoefficientsPermutations And CombinationsClass 11Selection CountingMathematicsClass 11 Mcq

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