MCQ
Mark $(\checkmark)$ against the correct answer:
How many $4-$digit numbers are there?
  • A
    $8999$
  • $9000$
  • C
    $8000$
  • D
    None of these.

Answer

Correct option: B.
$9000$

 The largest four-digit number $= 9999$
The smallest four-digit number $= 1000$
Total number of all four-digit numbers $= (9999 - 1000) + 1$
$= 8999 + 1$
$= 9000$

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