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# Avoiding Traps in GMAT Quant Questions

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Math Expert
Joined: 02 Sep 2009
Posts: 58422
Avoiding Traps in GMAT Quant Questions  [#permalink]

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06 May 2015, 02:46
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Intern
Joined: 21 Jan 2018
Posts: 9
Location: India
Schools: ISB '21
GMAT 1: 730 Q50 V38
GMAT 2: 690 Q48 V37
GPA: 3.98
Re: Avoiding Traps in GMAT Quant Questions  [#permalink]

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18 Apr 2019, 08:45
1
Hi Bunuel

I approached the question in a different way and still got the same answer.
While the explanation considers Permutations, I considered Combinations of numbers.

Selecting 2 numbers from 10 = 10C2 = 45
Picking two numbers such that the sum is less than 5.5 =
(1,2) or (2,1)
(1,3) or (3,1)
(1,4) or (4,1)
(2,3) or (3,2)

Total 4 ways.
So, the probability is 4/45.

But in the explanation, it is mentioned that "Since the order matters"
Is there a flaw in my approach?
Intern
Joined: 22 Sep 2016
Posts: 47
Location: India
GMAT 1: 680 Q44 V39
Re: Avoiding Traps in GMAT Quant Questions  [#permalink]

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20 Apr 2019, 23:57
teja8341 wrote:
Hi Bunuel

I approached the question in a different way and still got the same answer.
While the explanation considers Permutations, I considered Combinations of numbers.

Selecting 2 numbers from 10 = 10C2 = 45
Picking two numbers such that the sum is less than 5.5 =
(1,2) or (2,1)
(1,3) or (3,1)
(1,4) or (4,1)
(2,3) or (3,2)

Total 4 ways.
So, the probability is 4/45.

But in the explanation, it is mentioned that "Since the order matters"
Is there a flaw in my approach?

Bunuel,

Thanks.
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Best,
Spiritual Yoda
Math Expert
Joined: 02 Sep 2009
Posts: 58422
Re: Avoiding Traps in GMAT Quant Questions  [#permalink]

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21 Apr 2019, 00:06
SpiritualYoda wrote:
teja8341 wrote:
Hi Bunuel

I approached the question in a different way and still got the same answer.
While the explanation considers Permutations, I considered Combinations of numbers.

Selecting 2 numbers from 10 = 10C2 = 45
Picking two numbers such that the sum is less than 5.5 =
(1,2) or (2,1)
(1,3) or (3,1)
(1,4) or (4,1)
(2,3) or (3,2)

Total 4 ways.
So, the probability is 4/45.

But in the explanation, it is mentioned that "Since the order matters"
Is there a flaw in my approach?

Bunuel,

Thanks.

You can find discussion of this question here: https://gmatclub.com/forum/if-you-selec ... 96042.html

Hope it helps.
_________________
Re: Avoiding Traps in GMAT Quant Questions   [#permalink] 21 Apr 2019, 00:06
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