Number is 11.
1 (+1) 2 (+2) 4 (+3) 7 (+4) 11 (+5) 16 ...
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16. 1 is added to the difference each time: 1 + 1 = 2 2 + 2 = 4 4 + 3 = 7 7 + 4 = 11 11 + 5 = 16 [the missing number] 16 + 6 = 22
c) 17
The sequence consists of perfect squares: (3^2 = 9), (4^2 = 16), (5^2 = 25), and (7^2 = 49). The missing number corresponds to (6^2), which is 36. Therefore, the missing number in the sequence is 36.
36
-8