Free Practice Question
PS · Problem Solving
505-555
Number Properties
If x and y are integers, then xy(x + y) is
Answer Choices
Correct answer marked belowA
Always positive
B
Always negative
C
Positive when x is positive
D
Negative when x is negative
It cannot be determined by the information given
Correct
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Explanation
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Sign in to commentWhat this question tests
What it tests
Your command of divisibility, primes, factors, parity, and how the GMAT tests properties of integers.
Common trap
Forgetting that 1 is not prime, that 0 is divisible by every integer, or that negative numbers flip your assumptions.
Details
Difficulty
505-555
Type
PS
Category