Multiple choice

The sum of all natural numbers from 100 to 300 which are exactly divisible by 4 or 5 is

  1. 10200

  2. 15200

  3. 16200

  4. None of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Use inclusion-exclusion: Sum of multiples of 4 (10200) + Sum of multiples of 5 (8200) - Sum of multiples of 20 (2200, counted twice). Total = 10200 + 8200 - 2200 = 16200.