Multiple choice

Directions: Find the missing number in the following series. 890, 781, 672, ?, 454, 345

  1. 601

  2. 582

  3. 563

  4. 521

  5. 482
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C Correct answer
Explanation

The pattern is -109: 890 - 109 = 781, 781 - 109 = 672, 672 - 109 = 563, 563 - 109 = 454, 454 - 109 = 345.

AI explanation

The series follows a pattern of subtracting consecutive decreasing multiples of 109. The difference between 890 and 781 is 109, and the difference between 781 and 672 is also 109. The next differences should be 109, so subtracting 109 from 672 gives the missing term 563. Subtracting 109 from 563 gives 454, which perfectly matches the next number in the series. The missing number is 563.

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