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What is the units digit of
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30 Aug 2021, 07:26
30 Aug 2021, 07:26
Expert Reply
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Question Stats:
63% (00:50) correct
36% (00:46) wrong based on 19 sessions
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What is the units digit of \((7)^4(19)^3(23)^5\) ?
(A) 1
(B) 3
(C) 5
(D) 7
(E) 9
Kudos for the right answer and explanation
Question part of the project GRE Quant/Math Extreme Challenge Daily (2021) Edition
GRE - Math Book
(A) 1
(B) 3
(C) 5
(D) 7
(E) 9
Kudos for the right answer and explanation
Question part of the project GRE Quant/Math Extreme Challenge Daily (2021) Edition
GRE - Math Book
Retired Moderator
Joined: 19 Nov 2020
Posts: 326
Given Kudos: 64
GRE 1: Q160 V152
What is the units digit of
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30 Aug 2021, 17:21
30 Aug 2021, 17:21
1
7 has a cycle of power raised to 4 ending with digit 1
9 has a cycle of power raised to 2 ending with digit 9
3 has a cycle of power raised to 4 ending with digit 1, and power of 5 will end with digit 3
1*9*3=27 and answer is D
9 has a cycle of power raised to 2 ending with digit 9
3 has a cycle of power raised to 4 ending with digit 1, and power of 5 will end with digit 3
1*9*3=27 and answer is D
gmatclubot
What is the units digit of [#permalink]
30 Aug 2021, 17:21
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