If \(f(x+1)=f(x)+1\) for all values of \(x,\) and \(f(7)=3,\) what is the value of \(f(3)?\)
A. -1
B. 3
C. 7
D. 11
E. 13
Answer: A
Source: Veritas Prep
If \(f(x+1)=f(x)+1\) for all values of \(x,\) and \(f(7)=3,\) what is the value of \(f(3)?\)
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Solution:
Letting x = 6, we have:
f(6 + 1) = f(6) + 1
f(7) = f(6) + 1
3 = f(6) + 1
2 = f(6)
Now letting x = 5, we have:
f(5 + 1) = f(5) + 1
f(6) = f(5) + 1
2 = f(5) + 1
1 = f(5)
Using the same argument, we see that f(4) = 0 and f(3) = -1.
Answer: A
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