1, 3, 10, 21, 64, 129, 356, 777

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129

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356

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Solution

The correct option is D 356
The correct pattern is x 2 + 1, x 3 + 1, x 2 + 1, x 3 + 1,.....
So, 356 is wrong and must be replaced by (129 x 3 + 1) i.e. 388.

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