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n-1 a multiple of 3?

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canuckclint: Master | Next Rank: 500 Posts; Posts: 154; Joined: Tue Aug 26, 2008 12:59 pm; Location: Canada; Thanked: 4 times

n-1 a multiple of 3?

by canuckclint » Fri Oct 31, 2008 6:01 pm

Is positive integer n – 1 a multiple of 3?

(1) n3 – n is a multiple of 3

(2) n3 + 2n2+ n is a multiple of 3

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Source: Beat The GMAT — Problem Solving | Fri Oct 31, 2008 6:01 pm

cramya: Legendary Member; Posts: 2467; Joined: Thu Aug 28, 2008 6:14 pm; Thanked: 331 times; Followed by:11 members

by cramya » Fri Oct 31, 2008 8:11 pm

Refer to

https://www.beatthegmat.com/divisibility ... t8627.html

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