Consider the following for any three non-empty sets A, B, and C

1. A – (B ∪ C) = (A - B) ∪ (A - C)

2. A – B = A – (A ∩ B)

3. A = (A ∩ B) ∪ (A - B)

Which of the above is/are correct?

  1. only 1
  2. 2 and 3
  3. 1 and 2
  4. 1 and 3

Answer (Detailed Solution Below)

Option 2 : 2 and 3
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NDA 01/2025: English Subject Test
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Detailed Solution

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Calculation:

F2 Aman.K 10-08-2020 Savita D4

Statement -1: A – (B ∪ C) = (A - B) ∪ (A - C)

LHS = (a, b, c, d) – (b, c, d, e, f, g) = a

RHS = (a, b) ∪ (a, d) = a, b, d

Here LHS ≠ RHS. So this statement is not correct.

Statement - 2: A – B = A – (A ∩ B)

LHS = a, b

RHS = (a, b, c, d) – (c, d) = a, b

So, this statement is correct.

Statement - 3: A = (A ∩ B) ∪ (A - B)

LHS = a, b, c, d

RHS = (c, d) ∪ (a, b) = a, b, c, d

So, this statement is also correct.

Hence, option (2) is correct.

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