4.5, 16, ?, 33, 38.5, 42, 43.5
Explanation:
Let us calculate the difference between consecutive terms.
16 – 4.5 = 11.5
? – 16 = ??
33 - ?? = ???
38.5 – 33 = 5.5
42 – 38.5 = 3.5
43.5 – 2 = 1.5
The difference between consecutive terms is itself decreasing by 2.
∴ ? – 16 = 9.5
⇒ ? = 25.5
Hence, option (b).
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