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If X and Y are sets of integers, X@Y denotes the set of inte
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29 May 2012, 08:09
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If X and Y are sets of integers, X@Y denotes the set of inte
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Re: If X and Y are sets of integers, X@Y denotes the set of inte
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02 Jan 2014, 10:15
IMO B. Set X=10 Set Y=18 both X&Y = 6 (Either X or Y or both) = (X) + (Y)  (both X&Y) = 10+186 = 22 Now we want a set of integers from either X or Y but not from both X and Y X@Y = (Either X or Y or both)  (Both X&Y) = 226 = 16.
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Re: If X and Y are sets of integers, X@Y denotes the set of inte
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02 Jan 2014, 11:24
Bunuel wrote: The Official Guide For GMAT® Quantitative Review, 2ND EditionIf X and Y are sets of integers, X@Y denotes the set of integers that belong to set X or set Y, but not both. If X consists of 10 integers, Y consists of 18 integers, and 6 of the integers are in both X and Y, then X@Y consists of how many integers? (A) 6 (B) 16 (C) 22 (D) 30 (E) 174 As per Set theory : A@B= A + B  2(A n B), so 10 + 182*6 = 16
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Re: If X and Y are sets of integers, X@Y denotes the set of inte
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02 Jan 2014, 23:53
If X and Y are sets of integers, X@Y denotes the set of integers that belong to set X or set Y, but not both. If X consists of 10 integers, Y consists of 18 integers, and 6 of the integers are in both X and Y, then X@Y consists of how many integers? (A) 6 (B) 16 (C) 22 (D) 30 (E) 174 Attachment:
untitled1.PNG [ 3.39 KiB  Viewed 8824 times ]
Sol: Look at above figure. Now X@Y = Number of elements in X and Y which are not present in Both. So X@Y= 106+186= 16 Ans B
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Re: If X and Y are sets of integers, X@Y denotes the set of inte
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03 Jan 2014, 03:03
If X and Y are sets of integers, X@Y denotes the set of integers that belong to set X or set Y, but not both. If X consists of 10 integers, Y consists of 18 integers, and 6 of the integers are in both X and Y, then X@Y consists of how many integers? (A) 6 (B) 16 (C) 22 (D) 30 (E) 174 Exactly 1 = X + Y  2(X&Y) When you add X and Y the intersection gets added twice hence we have to deduct it twice Exactly 1 = 10 + 18  12 = 16 Answer B
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Re: If X and Y are sets of integers, X@Y denotes the set of inte
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09 Jul 2014, 08:04
Bunuel wrote: carcass wrote: If X and Y are sets of integers, X # Y denotes the set of integers that belong to set X or set Y, but not both. If X consists of 10 integers, Y consists of 18 integers, and 6 of the integers are in both X and Y, then X # Y consists of how many integers?
A. 6 B. 16 C. 22 D. 30 E. 174 The number of integers that belong to set X ONLY is 106=4; The number of integers that belong to set Y ONLY is 186=12; The number of integers that belong to set X or set Y, but not both is 4+12=16. Answer: B. Hi I know its silly question but can you please clear my understanding? Why cannot I do.... 10+186??? am I not deducting both from X and Y by doing this??



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Re: If X and Y are sets of integers, X@Y denotes the set of inte
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09 Jul 2014, 08:16
GGMAT760 wrote: Bunuel wrote: carcass wrote: If X and Y are sets of integers, X # Y denotes the set of integers that belong to set X or set Y, but not both. If X consists of 10 integers, Y consists of 18 integers, and 6 of the integers are in both X and Y, then X # Y consists of how many integers?
A. 6 B. 16 C. 22 D. 30 E. 174 The number of integers that belong to set X ONLY is 106=4; The number of integers that belong to set Y ONLY is 186=12; The number of integers that belong to set X or set Y, but not both is 4+12=16. Answer: B. Hi I know its silly question but can you please clear my understanding? Why cannot I do.... 10+186??? am I not deducting both from X and Y by doing this?? That way you'll get the total number of elements in X and y, while we need the number of elements that belong to set X or set Y, but not both. 6 elements belong to both X and y, thus there are 106=4 unique elements in X and 186=12 unique elements in Y. Thus there are total of 4 + 12 = 16 unique elements in X and Y. Hope it's clear.
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Re: If X and Y are sets of integers, X@Y denotes the set of inte
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10 Jul 2014, 00:44
X #Y represents the shaded region as shown in diagram Answer = 16 = B
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Re: If X and Y are sets of integers, X@Y denotes the set of inte
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28 May 2015, 19:03
Is it possible to solve this problem using a matrix?



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Re: If X and Y are sets of integers, X@Y denotes the set of inte
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29 May 2015, 00:02
cg0588 wrote: Is it possible to solve this problem using a matrix? Hi cg0588, The question asks us the number of integers which belong to set X or Set Y but not both. This would be equal to the number of integers which belong to only set X + number of integers which belong to only set Y Please find below the matrix diagram of the solution We are given that set X consists of 10 integers out of which there are 6 integers which are common to set Y. Hence integers which belong to only set X = 10  6 = 4 Similarly, we know that set Y consists of 18 integers. As there are 6 integers which are common to set X, we will have 18  6 = 12 integers which belong to only set Y. Thus number of integers which belong to set X or set Y but not both = 4 + 12 = 16 Hope it's clear Regards Harsh
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Re: If X and Y are sets of integers, X@Y denotes the set of inte
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06 Mar 2018, 07:00
Quote: If X and Y are sets of integers, X@Y denotes the set of integers that belong to set X or set Y, but not both. If X consists of 10 integers, Y consists of 18 integers, and 6 of the integers are in both X and Y, then X@Y consists of how many integers?
(A) 6 (B) 16 (C) 22 (D) 30 (E) 174
Note that the 6 numbers belonging to both sets must be subtracted from set X and again from set Y. We can use the equation: X@Y= set X  both + set Y  both X@Y = 10  6 + 18  6 = 16 Answer: B
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Re: If X and Y are sets of integers, X@Y denotes the set of inte
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