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Question

If ‘2’ is subtracted from the last digit of every odd number and ‘1’ is added to the last digit of every even number, what will be the difference between the highest and the lowest numbers thus formed?


A

380

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B

456

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C

318

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D

548

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E

242

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Solution

The correct option is D

548


Given that five three-digit numbers are:

356 497 812 739 264

After ‘2’ is subtracted from the last digit of every odd number and ‘1’ is added to the last digit of every even number, the new numbers will be

356 + 1 = 357

812 + 1 = 813

264 + 1 = 265

497 - 2 = 495

739 - 2 = 737

Now, the difference between the highest and the lowest numbers = 813 - 265 = 548


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