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Function

by jainrahul1985 » Sat Jul 25, 2009 9:47 pm
Q27:
For all numbers x, the function f is defined by f(x) = 3x + 1 and the function g is defined
by g(x) = (x-1)/3
If c is a positive number, what is the value of g(c)?
(1) f(c) = 13
(2) f(1) = c
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer:
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by shibal » Sun Jul 26, 2009 5:26 am
don't put the OA in bold, use the spoiler

It's D b/c
stmt I
F(c)=13 --> 13=3x+1 ==> x=4... you can find g(c)
stmt II
F(1)=3*1+1 = 4... u can find g(c)
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