In the following series, find wrong number.
$7, 15, 32, 67, 138, 281.$

57

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67

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36

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87

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Solution

The correct option is B $67$
The wrong number is 68.
The pattern is as below.
7 x 2 + 1 = 15
15 x 2 + 2 = 32
32 x 2 + 3 = 67
67 x 2 + 4 = 138
138 x 2 + 5 = 281

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