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14 Mar 2016, 08:13
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
72% (02:20) correct
28%
(02:51)
wrong
based on 436
sessions
History
Date
Time
Result
Not Attempted Yet
Of the 200 candidates who were interviewed for a position at a call center, 100 had a two-wheeler, 70 had a credit card and 140 had a mobile phone. 40 of them had both, a two-wheeler and a credit card, 30 had both, a credit card and a mobile phone and 60 had both, a two wheeler and mobile phone and 10 had all three. How many candidates had none of the three?
A. 0
B. 10
C. 18
D. 20
E. 25
A. 0
B. 10
C. 18
D. 20
E. 25
14 Mar 2016, 08:23
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Bunuel
Apply the formula for n(AUBUC)
You get 190.
200-190 = 10
ajay2121988
Joined: 08 Feb 2016
Last visit: 27 Nov 2017
Posts: 47
Given Kudos: 25
Location: India
Concentration: Technology
Schools: AGSM '20 (A)
GMAT 1: 650 Q49 V30
GPA: 4
05 Feb 2017, 22:02
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Hi Bunuel,
I got the correct answer by chance. I did not get the meaning of the question correctly and I seem to be dissatisfied by the approach I followed.
Can you please point out mistake in my approach and/or suggest a better,more efficient way?
total candidates = 200.
So, A U B U C = 200.
100 = A ; 70= B; 140 = C.
40 = A n B (using n to denote intersection)
30 = B n C
60 = A n C
10 = A n B n C
Using AUBUC = A + B + C - {A n B + B n C + C n A} + A n B n C
I get 200 = 190. So I guess there is a gap of 10 somewhere. So let me go with 10.
I got the correct answer by chance. I did not get the meaning of the question correctly and I seem to be dissatisfied by the approach I followed.
Can you please point out mistake in my approach and/or suggest a better,more efficient way?
total candidates = 200.
So, A U B U C = 200.
100 = A ; 70= B; 140 = C.
40 = A n B (using n to denote intersection)
30 = B n C
60 = A n C
10 = A n B n C
Using AUBUC = A + B + C - {A n B + B n C + C n A} + A n B n C
I get 200 = 190. So I guess there is a gap of 10 somewhere. So let me go with 10.
Bunuel
