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Preserve Statement Independence
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GMAT
DI.107 Preserve Statement Independence
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Is f(2) > 0? Statement (1): f(x) = ax + b and a = 3. Statement (2): b = -7. A solution says statement (1) alone gives f(2) = -1. What is the independence error?
A
There is no error because f(2) = 2a + b can always use both statements before testing either.
B
The error is that statement (1) cannot use its own value a = 3.
C
The error is that f(2) should equal -4, not -1.
D
The solution used b = -7 from statement (2); statement (1) alone leaves b unknown.
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