ANSWERS: 2
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Note that 729 = 9*9*9. Now it is easy to find the rule according to which this sequence is built.
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The sequence is 10^3, 9^3, 8^3, 7^3, 6^3... so the next three terms would be 5^3 (125), 4^3 (64) and 3^3 (27.
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