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Doctors Medicines MCQs Q&A

  1. 35
  2. 45
  3. 51
  4. 62
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1 Answers

Option 1 : 35

Given:

A Class has 100 students with roll number from 101 to 200

Formula used:

n(P ∪ C ∪ B) = n(P) + n(P) + n(C) + n(B) – n(P ∩ B) – n(P ∩ C) – n(C ∩ B) + n(P ∩ C ∩ B)

Calculation:

Physics students be P

Chemistry students be C

Biology students be B

⇒ (100/2) + (100/5) + (100/7) –  –  – + 

⇒

⇒ (50 + 20 + 14.28 – 7.14 – 10 – 2.85 + 1.42)

⇒ (50 + 20 + 14 – 7 – 10 – 2 + 1)

⇒ 66

Students do not study any exam = ∪ – n(P ∪ C ∪ B)

⇒ 100 – 66 = 34 in approximately 35

∴ Students do not study any exam is 35.

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