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# The last digit of the positive even number n equals the last

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Founder
Joined: 18 Apr 2015
Posts: 13718
GRE 1: Q160 V160
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The last digit of the positive even number n equals the last [#permalink]  20 Apr 2018, 11:25
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Expert's post
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Question Stats:

43% (00:29) correct 56% (00:37) wrong based on 16 sessions
The last digit of the positive even number n equals the last digit of $$n^2$$ . Which one of the following could be n ?

(A) 12
(B) 14
(C) 15
(D) 16
(E) 17
[Reveal] Spoiler: OA

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Manager
Joined: 29 Nov 2017
Posts: 190
Location: United States
GRE 1: Q142 V146
WE: Information Technology (Computer Software)
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Kudos [?]: 94 [0], given: 99

Re: The last digit of the positive even number n equals the last [#permalink]  08 May 2018, 04:04
what kind of question is this..completely went bouncer.
Founder
Joined: 18 Apr 2015
Posts: 13718
GRE 1: Q160 V160
Followers: 305

Kudos [?]: 3552 [1] , given: 12677

Re: The last digit of the positive even number n equals the last [#permalink]  08 May 2018, 11:47
1
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Expert's post
You should stay calm and apply techniques useful for your goal.

If you use the answer choices to reach the solution the question is easy.

The stem says an even positive number so C and E are suddenly out.

Now n must match the last digit of $$n^2$$

12 = 144 ---- 2 and four. does not fit

14 = 196 ----- 4 and 6. does not match

16 = 4.096 ----- 6 and 6. Match. D is the answer.

You could recognize that $$6^2$$ is always a number that ends in 6.

Hope this helps

Regards
_________________

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- Do you want all the FREE GRE tests on earth ?? Look at FREE GRE Practice Tests [Collection] - New Edition (2021)
- Do you want to know the GRE score in the Top 25 BS in 7 continents ?? Look at here The GRE average score at Top 25 Business Schools 2020 Ed.
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Manager
Joined: 27 Feb 2017
Posts: 188
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Kudos [?]: 78 [1] , given: 15

Re: The last digit of the positive even number n equals the last [#permalink]  08 May 2018, 19:43
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I just made a careless mistake on the easiest question. Even though i read the question thouroughly and properly, while looking at answer choices, I completely forgot the 'even number' part and selected C
Manager
Joined: 29 Nov 2017
Posts: 190
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GRE 1: Q142 V146
WE: Information Technology (Computer Software)
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Kudos [?]: 94 [1] , given: 99

Re: The last digit of the positive even number n equals the last [#permalink]  09 May 2018, 05:08
1
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kruttikaaggarwal wrote:
I just made a careless mistake on the easiest question. Even though i read the question thouroughly and properly, while looking at answer choices, I completely forgot the 'even number' part and selected C

No problem GRE is all about learning from our mistakes and not repeating them, I can understand.
Manager
Joined: 29 Nov 2017
Posts: 190
Location: United States
GRE 1: Q142 V146
WE: Information Technology (Computer Software)
Followers: 1

Kudos [?]: 94 [1] , given: 99

Re: The last digit of the positive even number n equals the last [#permalink]  09 May 2018, 05:13
1
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Carcass wrote:
You should stay calm and apply techniques useful for your goal.

If you use the answer choices to reach the solution the question is easy.

The stem says an even positive number so C and E are suddenly out.

Now n must match the last digit of $$n^2$$

12 = 144 ---- 2 and four. does not fit

14 = 196 ----- 4 and 6. does not match

16 = 4.096 ----- 6 and 6. Match. D is the answer.

You could recognize that $$6^2$$ is always a number that ends in 6.

Hope this helps

Regards

Thank you for your reply.. Now I have understood it .. the wording of this question was a bit tricky for me, I should have looked at the answer choices however.
Re: The last digit of the positive even number n equals the last   [#permalink] 09 May 2018, 05:13
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