Multiple choice

Directions: Identify the missing or wrongly placed number in the series provided. 321, 345, 339, 360, 357, 381, 375, 399

  1. 339

  2. 375

  3. 360

  4. 381

  5. 345
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The series follows a pattern of adding 24, then subtracting 6. 321+24=345, 345-6=339, 339+24=363. The term 360 is incorrect; it should be 363.

AI explanation

The series follows two alternating patterns. Starting from 7, adding 5 gives 12, adding 28 gives 40, adding 182 gives 222, adding 1518 gives 1740 (not 1742), adding 15650 gives 17390, and adding 191218 gives 208608. The incorrect number is 1742.

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