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How many people bought TVs at the Electronics Depot?

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Joined: 02 Sep 2009
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How many people bought TVs at the Electronics Depot? [#permalink]

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New post 28 Sep 2017, 01:59
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Question Stats:

77% (00:48) correct 23% (01:09) wrong based on 20 sessions

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How many people bought TVs at the Electronics Depot?

(1) One out of every six Electronics Depot customers bought a TV.
(2) If four Electronics Depot customers are chosen at random there are 126 different groups of people that could be chosen.
[Reveal] Spoiler: OA

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How many people bought TVs at the Electronics Depot? [#permalink]

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New post 28 Sep 2017, 23:13
Statement 1) 1 in 6 bought a TV. We don't know how many customers so NOT SUFFICIENT.

Statement 2) Picking 4 people for a group out of a certain number of people would result in 126 combinations. Let's say there are K customers. K!/4!*(K-1)!=126. Deducing this gives us K=9. So we know number of Customers but we do not know how many bought TV.

Statement 1) Gives ratio of number of people who bought TV to Customers and Statement 2) Gives the number of customers.

So C, Both required but neither alone sufficient.

Kudos [?]: 4 [0], given: 34

How many people bought TVs at the Electronics Depot?   [#permalink] 28 Sep 2017, 23:13
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