Difficult Functions Problem

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cbrombe1: Newbie | Next Rank: 10 Posts; Posts: 7; Joined: Thu Aug 21, 2008 8:17 am

by cbrombe1 » Thu Feb 12, 2009 2:08 pm

Hello All,

I'm struggling on this problem :

If n is an integer and f(n) = f(n – 1) – n, what is the value of f (4)?

(1) f(3) = 14

(2) f(6) = -1

FYI, answer is D. Please advise..thanks!

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Source: Beat The GMAT — Data Sufficiency | Thu Feb 12, 2009 2:08 pm

mals24: Legendary Member; Posts: 683; Joined: Tue Jul 22, 2008 1:58 pmFollowed by: 2 members; Location: Dubai; Thanked: 73 times

by mals24 » Thu Feb 12, 2009 2:15 pm

St 1: f(3)=14

f(4) = f(3)-4

= 14-4 = 10...SUFF

St 2: f(6) = -1

-1 = f(5)-6
f(5) = 5

f(5) = f(4)-5

5=f(4)-5
f(4) = 10....SUFF

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