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27 Jan 2015, 07:49
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
74% (01:01) correct
26%
(01:45)
wrong
based on 549
sessions
History
Date
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Not Attempted Yet
For all positive integers x, f(x)=f(x+1). If f(3)=15, then what is f(7)?
A. 8
B. 12
C. 15
D. 21
E. 35
Kudos for a correct solution.
A. 8
B. 12
C. 15
D. 21
E. 35
Kudos for a correct solution.
02 Feb 2015, 03:00
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Bunuel
For all positive integers x, f(x)=f(x+1). If f(3)=15, then what is f(7)?
A. 8
B. 12
C. 15
D. 21
E. 35
Kudos for a correct solution.
A. 8
B. 12
C. 15
D. 21
E. 35
Kudos for a correct solution.
VERITAS PREP OFFICIAL SOLUTION:
This problem really just comes down to understanding the function notation. If f(x)=f(x+1), that means that:
f(3)=f(3+1)=f(4)
and that
f(4)=f(4+1)=f(5)
and so on, meaning that really all functions equal the same thing as the next function up, so all functions are equal. That means that f(7) is the same thing as f(3), which we're told is 15. Therefore the answer is 15.
General Discussion
27 Jan 2015, 08:39
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ans C... all values of x should be the same ie 15.. unless i am missing something here
