Question 9

5, 21, 69, 213, 645, ?

Solution

Given series follows a pattern described below:

5+(16*1) = 21
21+(16*3) = 69
69+(16*3*3) = 213
213+(16*3*3*3) = 645
Hence next digit will be 645+(16*3*3*3*3) = 1941

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5, 21, 69, 213, 645, __?__

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5, 21, 69, 213, 645, ?