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NDA2024MathematicsPermutation and CombinationActual

How many four-digit natural numbers are there such that all of the digits are even?

Options

  1. A625
  2. B500
  3. C400
  4. D256

Correct answer

B. 500

Step-by-step solution

All even digits are Hence, total required number =4 5 5 5=500 .

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