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What should come in place of the question mark '?' in the following number series? -7, -15, -31, -63, ?, -255

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What should come in place of the question mark '?' in the following number series?

-7, -15, -31, -63, ?, -255
1. -124
2. -126
3. -128
4. -127
5. -129
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Correct Answer - Option 4 : -127

Calculation∶

The series follows following pattern

-7 – 8 = -15

-15 – 16 = -31

-31 – 32 = -63

-63 – 64 = -127

-127 – 128 = -255

∴ The value of ? is -127
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