Multiple choice

Find the wrong term in the given series. $105, 85, 60, 30, 0, -45, -90$

  1. $85$
  2. - $45$
  3. $105$
  4. $0$
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D Correct answer
Explanation

The series follows a subtraction pattern: 105-20=85, 85-25=60, 60-30=30, 30-35=-5. The term 0 is incorrect; it should be -5.

AI explanation

The differences between the consecutive terms follow the pattern of subtracting 20: 105 minus 85 is 20, 85 minus 60 is 25, and 60 minus 30 is 30. The intended differences are 20, 25, 30, 35, 40 and 45, which means 30 minus 35 gives -5 instead of 0. Therefore, 0 is the wrong term, and the result is 0.

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