In a random survey 250 people participated. Out of 250 people who took part in the survey, 40 people have listened to pink Floyd. 30 people have listened to Metallica and 20 people have listened to John Denver. If 10 people has listened to all three then find the number of people who have listened only pink Floyd.
options-(A)10. (B)20. (C)30. (D)25

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Solution

the above solution is correct and the answer will be 30 and not 20

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