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What should come in place of the question mark '?' in the following number series?

399, 360, 323, 288, 255, ?


1. 225
2. 224
3. 223
4. 324
5. 220

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Correct Answer - Option 2 : 224

Calculation:

399 - 39 = 360

360 - 37 = 323

323 - 35 = 288

288 - 33 = 255

255 - 31 = 224

∴ ? = 224

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