Identify the term that will replace the ?
$1, 2, 6, 7, 21, 22, 66, 67, ?$

70

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134

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201

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301

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Solution

The correct option is C $201$
The difference between the successive terms follow the $+ 1, \times 3, + 1, \times 3$
So,missing term $= 67$ $\times$ $3 = 201$
Hence,option C is the correct answer

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