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Railways PYQCBT 2 2017

RRB NTPC · Question 46

Read the following information and answer the questions given below: A has 28 elements, B has 32 elements and (A U B) has 40 elements. How many elements does A ∩ B have?

  1. 12

  2. 8

  3. 10

  4. 20

Show answer & explanation

Answer: (D) 20

Explanation

n(A ∩ B) = n(A) + n(B) − n(A ∪ B) = 28 + 32 − 40 = 20.