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functions - MGMAT

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by AleksandrM » Tue Jun 10, 2008 4:22 pm
got this one right. But I am curious to see other approaches

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
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Source: — Data Sufficiency |
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by durgesh79 » Tue Jun 10, 2008 9:09 pm
I could do it just by applyng the logic that if I have the value of f(x) i can find out the value of both f(x-1) and f(x+1).

So if have f(3), i can find out f(4) in one step and if i have f(6) i can find out f(4) in two steps.

The answer is D.
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by AleksandrM » Wed Jun 11, 2008 9:01 am
Yeah, that's the way I thought about it. I think that's the only approach. Thanks, though.
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