Answer:
29
Explanation:
The sequence of values
5 , 13, 21 , ?
The values are increasing by 8 so missing value is
? = 21 + 8 = 29
12 + 8 = 20 , 20 + 8 = 28 , 28 + 8 = 36
5 + 8 = 13 , 13 + 8 = 21 , 21 + 8 = 29
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