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What number is next 7,21,8,72,9

What number is next 7,21,8,72,9
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What number is next 7,21,8,72,9

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User Roddy R
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Since the rule of this sequence is the powers of 3, the answer is 243 because 7 times 3 is 21, 8 times 9 is 72, and 9 times 27 is 243.
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User Jason Wiener
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