In how many ways can a teacher in a kindergarten school arrange a group of 3 children (Susan, Tim and Zen) on 3 identical chairs in a straight line so that Susan is on the left of Tim?
Correct answer: B
Explanation
Total ways in which 3 children can be arranged on 3 chairs = 3*2*1 = 6
But in half cases Susan will be left of Tim and in other half of cases Tim will be on left of Susan
i.e. Desired cases in which Susan is on the left of Tim = (1/2)*6 = 3
B
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AQuA-RAT items are crowdsourced algebra problems, not ACT questions. They carry five answer choices in the pre-2025 ACT Mathematics style and no ACT reporting category. Useful for drilling Preparing for Higher Math content; not a substitute for a real form.