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3^20 + 3^20 + 3^20 =
[#permalink]
10 Apr 2020, 09:22
10 Apr 2020, 09:22
Expert Reply
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Question Stats:
92% (00:15) correct
7% (00:17) wrong based on 39 sessions
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\(3^{20}+3^{20}+3^{20}=\)
A. \(9^{60}\)
B. \(9^{20}\)
C. \(3^{60}\)
D. \(3^{23}\)
E. \(3^{21}\)
Kudos for the right answer and explanation
A. \(9^{60}\)
B. \(9^{20}\)
C. \(3^{60}\)
D. \(3^{23}\)
E. \(3^{21}\)
Kudos for the right answer and explanation
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: 3^20 + 3^20 + 3^20 =
[#permalink]
10 Apr 2020, 14:15
10 Apr 2020, 14:15
1
Carcass wrote:
\(3^{20}+3^{20}+3^{20}=\)
A. \(9^{60}\)
B. \(9^{20}\)
C. \(3^{60}\)
D. \(3^{23}\)
E. \(3^{21}\)
Kudos for the right answer and explanation
A. \(9^{60}\)
B. \(9^{20}\)
C. \(3^{60}\)
D. \(3^{23}\)
E. \(3^{21}\)
Kudos for the right answer and explanation
In the same way that \(k + k + k = 3k\), and \(2x^7 + 2x^7 + 2x^7 = (3)(2x^7)\),....
... we can write: \(3^{20}+3^{20}+3^{20}=(3)(3^{20})\)
\(=(3^1)(3^{20})\)
\(=3^{21}\)
Answer: E
Cheers,
Brent
gmatclubot
Re: 3^20 + 3^20 + 3^20 = [#permalink]
10 Apr 2020, 14:15
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