Instructions

The following questions are based on the given 3-digit numbers.
821 547 452 935 368

Question 100

If '2' is added to the second digit of all even numbers and '3' is subtracted from the first digit of all odd numbers, in how many numbers thus formed will a digit appear twice ?

Solution

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Series : 821 547 452 935 368

If '2' is added to the second digit of all even numbers and '3' is subtracted from the first digit of all odd numbers, new numbers : 

821 -> 521

547 -> 247

452 -> 472

935 -> 635

368 -> 388

Thus, only in the last number, 8 appears twice.

=> Ans - (E)

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