Multiple choice

A series is given with one/two/three term missing. Choose the correct alternative from the given ones that will complete the series. 92, 51, 20, -1, -12, ?

  1. -12

  2. -13

  3. -18

  4. -7
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B Correct answer
Explanation

The pattern follows decreasing differences: 92-51=41, 51-20=31, 20-(-1)=21, (-1)-(-12)=11. The differences (41, 31, 21, 11) decrease by 10 each time. The next difference should be 11-10=1. Therefore: -12 - 1 = -13. This is a decreasing arithmetic progression of differences pattern.

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