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GMATbuster92
Joined: 28 Jun 2018
Last visit: 20 Jul 2019
Posts: 147
Own Kudos:
Given Kudos: 32
Location: India
Concentration: Finance, Marketing
Schools: CUHK '21 (II)
GMAT 1: 650 Q49 V30
GPA: 4
Products:
21 Aug 2018, 02:25
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Hi
I believe set cannot have duplicate values (also taught to us in Princeton Review classes) but I come across some questions on this platform where they are considering Duplicate values in set , Can any moderator can clearly tell me whether we can consider duplicate values in set or not?
Bunuel and chetan2u , can you please answer this query. Because every time I asked someone , I get contradictory answers to my question.
I would Really appreciate your time .
I believe set cannot have duplicate values (also taught to us in Princeton Review classes) but I come across some questions on this platform where they are considering Duplicate values in set , Can any moderator can clearly tell me whether we can consider duplicate values in set or not?
Bunuel and chetan2u , can you please answer this query. Because every time I asked someone , I get contradictory answers to my question.
I would Really appreciate your time .
21 Aug 2018, 11:23
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Hi GMATbuster92,
On the GMAT, a "set" of numbers is a 'group' of numbers. Unless the prompt gives you information that 'restricts' what could be in the set, then ANY number is possible - including duplicate numbers. The specific wording of the prompt dictates how you should think about the information provided. For example, consider...
Set X = {1, 3, 5, Z}
We're not told ANYTHING about Z, so that variable could be ANY value. It's not necessarily greater than 5 and it's not necessarily an odd number - again, because we have not been told anything about Z. By extension, Z could potentially be 1, 3 or 5.
If a question asks you to combine two sets and asks for the number of 'different' elements, then THAT would mean we should ignore the duplicates...
Set A = {1, 2, 3} and Set B = {2, 3, 4}
Combining these sets, the number of DIFFERENT elements would be 4 --> {1, 2, 3 and 4}
A similar concept can sometimes appear in Prime Factorization questions...
How many DISTINCT Prime factors are there in the number 24?
24 = (2)(2)(2)(3).... so while there are technically 4 prime numbers (three 2s and one 3), there are only 2 DISTINCT prime factors (2 and 3).
This is all meant to say that you have to pay attention to whatever 'restrictions' the prompt places on you (including the specific question that the prompts asks you to solve).
GMAT assassins aren't born, they're made,
Rich
On the GMAT, a "set" of numbers is a 'group' of numbers. Unless the prompt gives you information that 'restricts' what could be in the set, then ANY number is possible - including duplicate numbers. The specific wording of the prompt dictates how you should think about the information provided. For example, consider...
Set X = {1, 3, 5, Z}
We're not told ANYTHING about Z, so that variable could be ANY value. It's not necessarily greater than 5 and it's not necessarily an odd number - again, because we have not been told anything about Z. By extension, Z could potentially be 1, 3 or 5.
If a question asks you to combine two sets and asks for the number of 'different' elements, then THAT would mean we should ignore the duplicates...
Set A = {1, 2, 3} and Set B = {2, 3, 4}
Combining these sets, the number of DIFFERENT elements would be 4 --> {1, 2, 3 and 4}
A similar concept can sometimes appear in Prime Factorization questions...
How many DISTINCT Prime factors are there in the number 24?
24 = (2)(2)(2)(3).... so while there are technically 4 prime numbers (three 2s and one 3), there are only 2 DISTINCT prime factors (2 and 3).
This is all meant to say that you have to pay attention to whatever 'restrictions' the prompt places on you (including the specific question that the prompts asks you to solve).
GMAT assassins aren't born, they're made,
Rich
GMATbuster92
Joined: 28 Jun 2018
Last visit: 20 Jul 2019
Posts: 147
Own Kudos:
Given Kudos: 32
Location: India
Concentration: Finance, Marketing
Schools: CUHK '21 (II)
GMAT 1: 650 Q49 V30
GPA: 4
Products:
21 Aug 2018, 13:04
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EMPOWERgmatRichC
from above I can correctly infer that , set in gmat can have duplicate values until unless there are any restrictions or specific details mentioned.Please let me know if i miss something.
