Multiple choice

In the following number series, a term is wrong. Find that wrong term. 804 786 759 723 678 625

  1. 786

  2. 759

  3. 723

  4. 625

  5. 804
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D Correct answer
Explanation

This decreasing series has differences: 786-804=-18, 759-786=-27, 723-759=-36, 678-723=-45, 625-678=-53. The pattern in differences is -18, -27, -36, -45 (each 9 less). But the last difference is -53 instead of -54, breaking the pattern. 625 is incorrect; it should be 623 to maintain the difference of -54.

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