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Source: — Data Sufficiency |
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by arocks » Sat Oct 13, 2007 11:35 am
IMO - D

f(n) = f(n-1)-n ; Find f(4)

stmt1 f(3)=14
so, f(4) = f(4-1)-4
or f(3) -4
or 14-4 =10

stmt1 is suff.

stmt2 f(6)=-1
f(6)=f(6-1)-6=-1
or f(5)-6=-1
or f(5) = 5
so, f(5)=f(5-1)-5
or 5=f(4)-5
or 10=f(4)

stmt2 is suff.
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