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Permutations , combinations and binomial expansion — Statistics STD 11 Commerce — Question

Gujarat BoardEnglish MediumSTD 11 CommerceStatisticsPermutations , combinations and binomial expansion3 Marks
Question
In how many ways $3$ things can be selected from different $10$ things such that one particular thing $(1)$ is selected? $(2)$ is not selected?
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Answer

$(1)36$ $(2)84$

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