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Senior Manager  Joined: 07 Sep 2010
Posts: 256
Which of the answer choices properly lists the following in increasing  [#permalink]

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3
14 00:00

Difficulty:   65% (hard)

Question Stats: 61% (02:16) correct 39% (02:16) wrong based on 185 sessions

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Which of the answer choices properly lists the following in increasing order from left to right (all roots are positive):

$$2^{(\frac{1}{3})}$$

$$5^{(\frac{1}{6})}$$

$$10^{(\frac{1}{10})}$$

$$30^{(\frac{1}{15})}$$

A $$(2)^{(\frac{1}{3})}$$, $$(5)^{(\frac{1}{6})}$$, $$(10)^{(\frac{1}{10})}$$, $$(30)^{(\frac{1}{15})}$$

B. $$(10)^{(\frac{1}{10})}$$, $$(30)^{(\frac{1}{15})}$$, $$(2)^{(\frac{1}{3})}$$, $$(5)^{(\frac{1}{6)}}$$

C. $$(10)^{(\frac{1}{10})}$$, $$(2)^{(\frac{1}{3})}$$, $$(5)^{(\frac{1}{6})}$$, $$(30)^{(\frac{1}{15})}$$

D. $$(30)^{(\frac{1}{15})}$$, $$(2)^{(\frac{1}{3})}$$, $$(10)^{(\frac{1}{10})}$$, $$(5)^{(\frac{1}{6})}$$

E. $$(30)^{(\frac{1}{15})}$$, $$(10)^{(\frac{1}{10})}$$, $$(2)^{(\frac{1}{3})}$$, $$(5)^{(\frac{1}{6})}$$

Originally posted by imhimanshu on 11 Sep 2013, 17:59.
Last edited by Bunuel on 12 Apr 2018, 10:26, edited 1 time in total.
Edited the options.
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Veritas Prep GMAT Instructor D
Joined: 16 Oct 2010
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Location: Pune, India
Re: Which of the answer choices properly lists the following in increasing  [#permalink]

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imhimanshu wrote:
Which of the answer choices properly lists the following in increasing order from left to right (all roots are positive):

(2)^(1/3) 5^(1/6) (10)^(1/10) 30^(1/15)

a) (2)^(1/3) 5^(1/6) (10)^(1/10) 30^(1/15)
b) (10)^(1/10) 30^(1/15) (2)^(1/3) 5^(1/6)
c)(10)^(1/10) (2)^(1/3) 5^(1/6) 30^(1/15)
d) 30^(1/15) (2)^(1/3) (10)^(1/10) 5^(1/6)
e) 30^(1/15) (10)^(1/10) (2)^(1/3) 5^(1/6)

Please explain how to go about this.

Responding to a pm:
Here your first problem is the fractional powers. We cannot compare them in anyway until and unless we get rid of those so you raise each term to a power of 30..
You get rid of all fractional powers. Now you don't need to make anything same - base or power. The numbers are quite comparable without doing anything: 2^10 = 1024, 5^5 = 625*5 which is more than 3000, 10^3 = 1000 and 30^2 = 900
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Manager  Joined: 04 Apr 2013
Posts: 118
Re: Which of the answer choices properly lists the following in increasing  [#permalink]

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imhimanshu wrote:
Which of the answer choices properly lists the following in increasing order from left to right (all roots are positive):

(2)^(1/3) 5^(1/6) (10)^(1/10) 30^(1/15)

a) (2)^(1/3) 5^(1/6) (10)^(1/10) 30^(1/15)
b) (10)^(1/10) 30^(1/15) (2)^(1/3) 5^(1/6)
c)(10)^(1/10) (2)^(1/3) 5^(1/6) 30^(1/15)
d) 30^(1/15) (2)^(1/3) (10)^(1/10) 5^(1/6)
e) 30^(1/15) (10)^(1/10) (2)^(1/3) 5^(1/6)

Please explain how to go about this.

himanshu,

My reasoning,

take lcm of 1/3, 1/6, 1/10, 1/15 -- LCM is 1/30

Now power each digit by 30 and the result is

2^10, 5^5, 10^3, 30^2

so order is 30^2, 10^3, 2^10, 5^5 ---> E
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Maadhu

MGMAT1 - 540 ( Trying to improve )
##### General Discussion
Senior Manager  Joined: 07 Sep 2010
Posts: 256
Re: Which of the answer choices properly lists the following in increasing  [#permalink]

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maaadhu wrote:
imhimanshu wrote:
Which of the answer choices properly lists the following in increasing order from left to right (all roots are positive):

(2)^(1/3) 5^(1/6) (10)^(1/10) 30^(1/15)

a) (2)^(1/3) 5^(1/6) (10)^(1/10) 30^(1/15)
b) (10)^(1/10) 30^(1/15) (2)^(1/3) 5^(1/6)
c)(10)^(1/10) (2)^(1/3) 5^(1/6) 30^(1/15)
d) 30^(1/15) (2)^(1/3) (10)^(1/10) 5^(1/6)
e) 30^(1/15) (10)^(1/10) (2)^(1/3) 5^(1/6)

Please explain how to go about this.

himanshu,

My reasoning,

take lcm of 1/3, 1/6, 1/10, 1/15 -- LCM is 1/30

Now power each digit by 30 and the result is

2^10, 5^5, 10^3, 30^2

so order is 30^2, 10^3, 2^10, 5^5 ---> E

Thanks Madhu,
However, my doubt is Is it possible to approach this problem by making bases same instead of exponents. I believe, that is more natural to me.
Please suggest.
Thanks
Manager  Joined: 04 Apr 2013
Posts: 118
Re: Which of the answer choices properly lists the following in increasing  [#permalink]

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imhimanshu wrote:
maaadhu wrote:
imhimanshu wrote:
Which of the answer choices properly lists the following in increasing order from left to right (all roots are positive):

(2)^(1/3) 5^(1/6) (10)^(1/10) 30^(1/15)

a) (2)^(1/3) 5^(1/6) (10)^(1/10) 30^(1/15)
b) (10)^(1/10) 30^(1/15) (2)^(1/3) 5^(1/6)
c)(10)^(1/10) (2)^(1/3) 5^(1/6) 30^(1/15)
d) 30^(1/15) (2)^(1/3) (10)^(1/10) 5^(1/6)
e) 30^(1/15) (10)^(1/10) (2)^(1/3) 5^(1/6)

Please explain how to go about this.

himanshu,

My reasoning,

take lcm of 1/3, 1/6, 1/10, 1/15 -- LCM is 1/30

Now power each digit by 30 and the result is

2^10, 5^5, 10^3, 30^2

so order is 30^2, 10^3, 2^10, 5^5 ---> E

Thanks Madhu,
However, my doubt is Is it possible to approach this problem by making bases same instead of exponents. I believe, that is more natural to me.
Please suggest.
Thanks

Himanshu,

When comparing numbers, you have to multiply with the same number or divide by same number.

In this case, if you multiply or divide by the same number, your bases will not be equal. Even if you try to make the base a multiple of 10, its hard to figure out because you still have fraction exponents.
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Maadhu

MGMAT1 - 540 ( Trying to improve )
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Re: Which of the answer choices properly lists the following in increasing  [#permalink]

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imhimanshu wrote:
Which of the answer choices properly lists the following in increasing order from left to right (all roots are positive):

2^(1/3)
5^(1/6)
10^(1/10)
30^(1/15)

A (2)^(1/3) 5^(1/6) (10)^(1/10) 30^(1/15)
B. (10)^(1/10) 30^(1/15) (2)^(1/3) 5^(1/6)
C. (10)^(1/10) (2)^(1/3) 5^(1/6) 30^(1/15)
D. 30^(1/15) (2)^(1/3) (10)^(1/10) 5^(1/6)
E. 30^(1/15) (10)^(1/10) (2)^(1/3) 5^(1/6)

I didn't think much
clearly 30^(1/15) is the smallest one
10^(1/10) will be the second one
so all but E are eliminated.
Non-Human User Joined: 09 Sep 2013
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Re: Which of the answer choices properly lists the following in increasing  [#permalink]

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_________________ Re: Which of the answer choices properly lists the following in increasing   [#permalink] 14 May 2019, 00:15
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