Identify the wrong number in the below series 11 9 21 59 243 1199 7201 ........

Quantitative Aptitude (Phase-1) Number series

Identify the wrong number in the below series:

11, 9, 21, 59, 243, 1199, 7201

This questions was previously asked in

Nabard grade-A, Previous year Memory Based Paper (2023)

243

1199

- To find the wrong number in the series, first look at the pattern.

- The sequence seems unpredictable, so examine the differences or ratios.

- Attempt to decipher if each number follows a specific formula or relation.

- Option 1: 9 - Seems to follow from 11 by decreasing.

- Option 2: 59 - Appears consistent if one examines the difference from previous terms.

- Option 3: 243 - Doesn't seem to fit any consistent progression.

- Option 4: 1199 - Could potentially fit a multiplicative pattern.

- Option 5: 21 - Seems a plausible progression from 9.

The wrong number in the series is likely 243.

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