Replace the question mark with the next number.
14, 1, 13, 0, 23, 21, ?
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One answer could be
Around zero(the central number, around which the remaining 6 numbers are dispersed), the spreading -out differences form a sequence of an arithmetic progression with a common difference of 10. So the ? should be 44
(23 - 13), (21 - 1), ( ? - 14) forming A.P. and thereby giving ? = 44.