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Question

# In the following number series, a wrong number is given. out the wrong number. 8, 18, 40, 86, 178, 370, 752

A
86
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B
178
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C
40
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D
370
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E
752
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Solution

## The correct option is B 17818 = 8 × 2 + 2 × 1; 40 = 18 × 2 + 2 × 2 86 = 40 × 2 + 2 × 3; 178 ≠ 86 × 2 + 2 × 4 370 ≠ 178 × 2 + 2 × 5; 752 = 370 × 2 + 2 × 6 ∴ 178 is wrong and should be replaced by 2 × 86 + 2 × 4 = 180 With this choice 5th place 2 × 180 + 2 × 5 = 370 which is according to the pattern.

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