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Explanation:

a1 = 1 = 6 – 5

a2 = 7 = 12 – 5 = 6 × 2 – 5

a3 = 19 = 24 – 5 = 6 × 22 – 5

a4 = 43 = 48 – 5 = 6 × 23 – 5

and so on.

Thus, a100 = 6 × 299 – 5

Hence, option (d).

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