If ‘2’ is added to the first digit of all even numbers and ‘2’ is subtracted from the third digit of all odd numbers. In how many numbers thus formed will a digit appear twice ?

Solution

Numbers : 732 517 293 315 638

If ‘2’ is added to the first digit of all even numbers and ‘2’ is subtracted from the third digit of all odd numbers, new numbers :

= 932 , 515 , 291 , 313 , 838

Thus, in three numbers (5,3,8) appear twice.

=> Ans - (E)

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