1. Z, Y, X, W, ___, ___,___,
2. a, a², a³,a⁴, ___, ___, ___,
3. 4, 8, 12, 16, 20, ___, ___, ___,
4. n, 2n, 3n, 4n, 5n, ___, ___, ___,
5. a, b, c, d, e, f, __, __, __,
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