7, 4, 5, 9, ?, 52.5, 160.5
Explanation:
2nd term: 4 = 7 × 1/2 + 1/2
3rd term: 5 = 4 × 1 + 1
4th term: 9 = 5 × 3/2 + 3/2
∴ 5th term: ? = 9 × 2 + 2 = 20
Hence, option (c).
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