Question
In a survey conducted among 100 college students in Bangalore, 100 students prefer jeans of Brand A, 80 prefer brand B, 75 prefer brand C, 70 prefer brand D and 80 prefer brand E. The minimum possible number of students who prefer all the five brands is___
Answer: Option A
:
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option (b)
The minimum value can be calculated using a short cut technique as given below.
Step 1 :Take the difference of all from 100( total number in question is 100)
100-100 = 0
100-80= 20
100-75= 25
100-70= 30
100-80= 20
∑ 95
Find the sum of all the differences = 95
Take the difference again from 100 = 100-95= 5
This is the minimum possible number of students preferring all 5 brands. Answer is option (b)
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