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06 Dec 2019, 06:17
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Difficulty:
85%
(hard)
Question Stats:
38% (01:57) correct
63%
(01:36)
wrong
based on 144
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For a positive integer n, if the units digit of n is not zero, what is the units digit of n^4 ?
(1) The units digit of n is equal to the units digit of n^3
(2) n is an even number
Are You Up For the Challenge: 700 Level Questions
(1) The units digit of n is equal to the units digit of n^3
(2) n is an even number
Are You Up For the Challenge: 700 Level Questions
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
https://gmatclub.com/forum/data-sufficiency-ds-141/
https://gmatclub.com/forum/data-sufficiency-ds-141/
06 Dec 2019, 19:08
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Statement 1-
Unit digit of n can be 1, 4, 5, 6 or 9
Unit digit of n^4 can be 1, 6, 5 or 9
Insufficient
Statement 2
Unit digit of n can be 2, 4, 6 or 8
Unit digit of n^4 is 6
Sufficient
Unit digit of n can be 1, 4, 5, 6 or 9
Unit digit of n^4 can be 1, 6, 5 or 9
Insufficient
Statement 2
Unit digit of n can be 2, 4, 6 or 8
Unit digit of n^4 is 6
Sufficient
Bunuel
ShankSouljaBoi
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Schools: Rotman '23 (D) IIMA PGPX'22 (D) Desautels '23 (D) Schulich Sept '23 (D) WBS (D) IIML IPMX'25 (A)
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12 Jan 2020, 04:07
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OMGGGG so trickyyyyyyyy
1---> could be 4 as cyclicity of 4 is 2
could be 6 with cyclicity 1
could be 5 with cyclicity 1
NOt sufficient.
2----> 2, 4 , 6 or 8 are the options. All yield 6 in their 4th powers respectively.
IM stumped. Need to go out for some time , I feel.
1---> could be 4 as cyclicity of 4 is 2
could be 6 with cyclicity 1
could be 5 with cyclicity 1
NOt sufficient.
2----> 2, 4 , 6 or 8 are the options. All yield 6 in their 4th powers respectively.
IM stumped. Need to go out for some time , I feel.
