Multiple choice

Find the wrong number in this series. 895 870 821 740 619 445 225

  1. 870

  2. 619

  3. 740

  4. 445

  5. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pattern involves subtracting consecutive odd squares: 895 - 5² = 870, 870 - 7² = 821, 821 - 9² = 740, 740 - 11² = 619. Following this pattern, 619 - 13² should equal 450, not 445. The next term would be 450 - 15² = 225.

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