In a class of boys stands in a single line. One boy is nineteenth in order from both the ends. How many boys are there in the class?
17
30
37
39
27
19×2-1=37
0, 2, 8, 14, ?, 34
1, 4, 2, 8, 6, 24, 22, 88, ?
1, 4, 9, 16, 25, ?
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