GMAT Quantitative Reasoning Practice Test 4

Question : 39 of 100

Marks: +1, -0

A

is an integer. Which of the following expressions must be even?

$A(A+2)-1$
$A(A-1)+1$
$(A+1)(A+2)$
$(A-1)(A+3)$
$A^2-1$

Validate

Solution:

Answer

(A+1)(A+2)

is a multiplication of two consecutive numbers, therefore one of them must be even, and an even number multiplied by a different number is an even number.

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