Multiple choice

Find the wrong number in this sequence: 72, 70, 67, 65, 58, 52, 45

  1. 58

  2. 65

  3. 52

  4. 70
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B Correct answer
Explanation

The pattern is subtracting consecutive integers starting from 2: 72-2=70, 70-3=67, 67-4=63 (not 65), 63-5=58, 58-6=52, 52-7=45. The number 65 is incorrect as it should be 63.

AI explanation

The pattern follows the method of subtracting prime numbers from 2 starting sequentially, or subtracting increasing values of 2, 3, 5, 7, 11, and 13. Working through the sequence, 72 - 2 = 70, 70 - 3 = 67, 67 - 5 = 62, 62 - 7 = 55, and 55 - 11 = 44, which means the sequence should have 62 and 55 instead of the listed 65 and 58. Therefore, 65 is the wrong term.

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