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Hussain15
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31 Oct 2009, 08:26
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N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
40% (01:44) correct
60%
(01:06)
wrong
based on 5
sessions
History
Date
Time
Result
Not Attempted Yet
What is the units digit of ( 6^15 - 7^4 - 9^3 )?
A) 8
B) 7
C) 6
D) 5
E) 4
A) 8
B) 7
C) 6
D) 5
E) 4
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Hussain15
Retired Moderator
Joined: 18 Jun 2009
Last visit: 07 Jul 2021
Posts: 1,075
Own Kudos:
Given Kudos: 157
Status:The last round
Concentration: Strategy, General Management
Schools: Stanford '14 (D) Booth '14 (D) Johnson '14 (D)
GMAT 1: 680 Q48 V34
Schools: Stanford '14 (D) Booth '14 (D) Johnson '14 (D)
GMAT 1: 680 Q48 V34
Posts: 1,075
Kudos:
3,539
31 Oct 2009, 08:41
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I want to tag this post as "number properties" along with "powers". How can I do it?? 
Hussain15
Is OA "E" ?
Unit digit for term 6^15 = 6
Unit digit for term 7^4 = 1
Unit digit for term 9^3 = 9
altogether unit digit for ( 6^15 - 7^4 - 9^3 ) = 6 -1 -9 = 4
Thanks.
