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If k is an odd integer, which of the following must be an even integer?

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by GMATprofessional21 » Wed Aug 05, 2020 2:13 am

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A

B

C

D

E

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If k is an odd integer, which of the following must be an even integer?
A k2 − 4
B 3k + 2
C 2k + 1
D (12k)/8
E (6k)/3

You can solve by substituting an even number, 0, into each of the options. Only C gives an even result hence C is the right answer.
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Source: — Problem Solving |

GMATprofessional21 wrote:
Wed Aug 05, 2020 2:13 am
If k is an odd integer, which of the following must be an even integer?
A k2 − 4
B 3k + 2
C 2k + 1
D (12k)/8
E (6k)/3

Solution:

Since 6k/3 = 2k and 2k is a multiple of 2, then it must be even.

Answer: E

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