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2. A Halloween survey of a gr 9 class on students’ most common fears reveals that 10 students are afraid of heights, 5 students are afraid of being in closed spaces and 15 students are afraid of insects.
a) In how many ways can we select a group of 4 students that are afraid of insects? [1K]
b) In part a), did you use permutations or combinations? Explain. [2C]
c) In how many ways can we select 6 students so that two are afraid of insects, two are afraid of heights and two are afraid of closed spaces? [2K]
Sagot :
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