Question
Find the value of x from the following Venn diagram if 
- 10
- 11
- 12
- none of these
Hint:
add the set elements and equate with 100
The correct answer is: 10
A U B U C is the summation of all the data present in all the three sets.
this implies that,
11+x + x + 3 + 8 + 2x + x + x-1 + x + 2 + 17 – x= 100
40 + 6x = 100
6x = 60
X = 10
union means non repetitive addition of data in sets. intersection means subtraction of data elements in sets.
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I)
II)
III)
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W:
X:
Y:
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U:
V:
W:
X:
Y:
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, it belong to -
, if value of n=7 the configuration will be -
and 
with stop cock S closed and stop cocks 
