Multiple choice general knowledge math & puzzles

1, 25, ….., 225, 400

  1. 75

  2. 125

  3. 200

  4. 100
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This series consists of perfect squares of numbers increasing by 5: 1² = 1, 5² = 25, 10² = 100, 15² = 225, 20² = 400. The missing term is 10² = 100. The other options (75, 125, 200) are not perfect squares.

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