9, 15, 26, 42, 63, ?
Explanation:
Let us calculate the difference between consecutive terms.
15 – 9 = 6
26 – 15 = 11
42 – 26 = 16
63 – 42 = 21
∴ ? – 63 = 26
⇒ ? = 63 + 26 = 89
Hence, option (c).
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