Discussion

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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