Find missing numbers in sequences

Q: Find missing numbers in sequences

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Question

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You are given several number sequences (integers and/or rational numbers). Each sequence contains exactly one missing term written as ?.

For each sequence, determine the missing term so that the sequence follows a consistent pattern.

Sequences

1, 2, 3, 16/5, 25/8, 36/13, ?, 49/21
2, 2, 3, 4, 5, 8, 8, ?, 16
4, 5, 9, 13, 22, 31, ?, 53
3, 2, 4, 4, 12, 36, ?, 396
2, 1, 2, 5, 13, 73/2, ?
1, 2, 5, 11, 26, 59, ?, 137

Output

Return the missing value for each sequence (in simplest fractional form when needed).

Find missing numbers in sequences

Sequences

Output

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