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If x = 33 n , n is a positive integral value, then the probability that x will have 3 at its units place is

Options

  1. A1 3
  2. B1 4
  3. C1 5
  4. D1 2

Correct answer

B. 1 4

Step-by-step solution

Given that, x = 33 n Where, n is a positive integral value. Here, only four digits may be at the unit place ie, 1 , 3 , 7 , 9 . ∴ n S = 4 Let E be the event of getting 4 at its units place. ∴ n E = 1 ∴ P E = n E n S = 1 4

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