What number will replace the ?
$- 1, 0, 3, 8, ?$

13

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12

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11

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15

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Solution

The correct option is D $15$
The series is $+ 1, + 3, + 5, + 7$ .
$x - 8 = + 7$
$x = 15$
So, option D is the correct answer.

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