• Reasoning Ability - Series
Question

80 42 24 13.5 8.75 6.375 5.1875

  • A) 8.75 
  • B) 13.5
  • C) 24 
  • D) 6.375
  • E) 42
Solution

Answer (c)

80, 42, 24, 13.5, 8.75, 6.375, 5.1875

5.1875 x 2 – (2×2) = 6.375

6.375 x 2 – (2×2) = 8.75

8.75 x 2 – (2×2) = 13.5

13.5 x 2 – (2×2) = 23

24 x 2 – (2×2) = 42

42 x2 – (2×2) = 80

So wrong number in the series is 24.

Answer (c)

80, 42, 24, 13.5, 8.75, 6.375, 5.1875

5.1875 x 2 – (2×2) = 6.375

6.375 x 2 – (2×2) = 8.75

8.75 x 2 – (2×2) = 13.5

13.5 x 2 – (2×2) = 23

24 x 2 – (2×2) = 42

42 x2 – (2×2) = 80

So wrong number in the series is 24.
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