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a, b, and c are integers greater than 1
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15 Feb 2022, 02:34
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a, b, and c are integers greater than 1 and \((c^b)^{5}=c^{5+a}\)
Quantity A
Quantity B
\(a\)
\(b\)
A) The quantity in Column A is greater. B) The quantity in Column B is greater. C) The two quantities are equal. D) The relationship cannot be determined from the information given.
a, b, and c are integers greater than 1
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15 Feb 2022, 07:24
2
Carcass wrote:
a, b, and c are integers greater than 1 and \((c^b)^{5}=c^{5+a}\)
Quantity A
Quantity B
\(a\)
\(b\)
A) The quantity in Column A is greater. B) The quantity in Column B is greater. C) The two quantities are equal. D) The relationship cannot be determined from the information given.
Given: \((c^b)^{5}=c^{5+a}\)
Apply the Power of a Power law to the left side to get: \(c^{5b}=c^{5+a}\)
Since the bases are equal, the exponents must be equal: \(5b = 5 + a\)
Subtract \(5\) from both sides to get: \(5b - 5 = a\)
Take Quantity A and replace \(a\) with \(5b - 5\) to get: QUANTITY A: \(5b - 5\) QUANTITY B: \(b\)
From here, we can solve the question using a technique called matching operations. See the video below.
Subtract \(b\) from both quantities: QUANTITY A: \(4b - 5\) QUANTITY B: \(0\)
Add \(5\) to both quantities: QUANTITY A: \(4b\) QUANTITY B: \(5\)
Divide both quantities by \(4\): QUANTITY A: \(b\) QUANTITY B: \(1.25\)
Since we are told that \(b\) is an INTEGER greater than 1, quantity A must be greater then quantity B
a, b, and c are integers greater than 1
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20 Feb 2024, 14:42
From the way I see it... since C not equal to 0, 1, -1, then C = C. as such we get 5b = 5+a. Divide 5 both sides to get b = 1+a but we know that a > 1. Therefore so b > a? or better still the relationship can't be determined since using matching operations gives us A and other means give us B. No?
Re: a, b, and c are integers greater than 1
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20 Feb 2024, 15:25
Thanks for your prompt response Carcass.. just as you simplified a = 5b - 5 does this mean we can't say b = 5 + a/5? because we do the latter, it will give us B > A.
Re: a, b, and c are integers greater than 1
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20 Feb 2024, 23:39
1
Ykayonu wrote:
Thanks for your prompt response Carcass.. just as you simplified a = 5b - 5 does this mean we can't say b = 5 + a/5? because we do the latter, it will give us B > A.
Hi,
Even when you say B = 5 + A/5, A is still greater than B. For instance, when A = 10, B = 7.
Likewise when you say A = 5B-5, when B = 2, A = 5.
In either case, A > B
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gmatclubot
Re: a, b, and c are integers greater than 1 [#permalink]