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NDA 2024
Exam
NDA
Year
2024
Subject
Mathematics
Chapter
Permutation and Combination

NDA 2024 · Mathematics · Permutation and Combination

How many four-digit natural numbers are there such that all of the...

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=4 \times 5 \times 5 \times 5=500. \text{. }
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