Question
7Â Â Â Â Â Â 15Â Â Â Â Â Â Â 31Â Â Â Â Â Â
63Â Â Â Â Â Â 127Â Â Â Â Â Â ? What should come in place of the question mark (?) in the following number series?Solution
7 × 2 + 1 = 15 15 × 2 + 1 = 31 31 × 2 + 1 = 63 63 × 2 + 1 = 127 127 × 2 + 1 = 255
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