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MHT CET20192 May 2019Morning ShiftMathematicsSets and RelationsActual

If A = x ∈ R : x 2 - 5 x + 6 = 0 , then n A = ________

Options

  1. A2
  2. B0
  3. C1
  4. D4

Correct answer

D. 4

Step-by-step solution

Given: A = x ∈ R : x 2 - 5 x + 6 = 0 x 2 - 5 x + 6 = 0 ⇒ x 2 - 5 x + 6 = 0 x = 2 , 3 ⇒ x = ± 2 , ± 3 Hence, n A = 4

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