A pair is a group of 2 people. In how many ways can we choose two pairs out of 5 people with replacement, such that both

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Vincen: Legendary Member; Posts: 2898; Joined: Thu Sep 07, 2017 2:49 pmFollowed by: 5 members; Thanked: 6 times

by Vincen » Fri Dec 11, 2020 12:51 am

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A pair is a group of 2 people. In how many ways can we choose two pairs out of 5 people with replacement, such that both the pair contain different persons?

A. 3
B. 4
C. 10
D. 15
E. 30

Answer: D

Source: Economist

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Source: Beat The GMAT — Problem Solving | Fri Dec 11, 2020 12:51 am

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