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

• A

  625
• Correct answer
  B

  500
• C

  400
• D

  256

Solution

All even digits are
Hence, total required number $=4 \times 5 \times 5 \times 5=500 \text {. }$

Hence, the correct answer is option: 'B'.