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# Assume 0 < r < 3. Below are five equations for x. Which equation has t

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Manager
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Joined: 02 Nov 2018
Posts: 177
Location: Bangladesh
Assume 0 < r < 3. Below are five equations for x. Which equation has t  [#permalink]

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20 Mar 2019, 10:46
00:00

Difficulty:

45% (medium)

Question Stats:

59% (01:52) correct 41% (01:43) wrong based on 17 sessions

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Assume 0 < r < 3. Below are five equations for x. Which equation has the largest solution x?

(A) $$3(1 + r)^x = 7$$

(B) $$3(1 +\frac{r}{10}) x = 7$$

(C) $$3(1 + 2r)^x = 7$$

(D) $$3(1 +√ r)^x= 7$$

(E) $$3(1 +\frac{1}{r}) x = 7$$

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Intern
Joined: 18 May 2017
Posts: 12
Re: Assume 0 < r < 3. Below are five equations for x. Which equation has t  [#permalink]

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20 Mar 2019, 11:50
only in case of B, x= 70/something much smaller. thus the chance of x being more than 2 or 3 gets higher
in all other choices x is more likely to remain around 1 or 2
tried to use Logarithm, but it was of no use. used the above logic and chose B.
Re: Assume 0 < r < 3. Below are five equations for x. Which equation has t   [#permalink] 20 Mar 2019, 11:50
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# Assume 0 < r < 3. Below are five equations for x. Which equation has t

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