1 Answers
Option 4 : 12734
Option 1: 12434
As, all the digits are different. So, this cannot be the train number.
Option 2: 12543
Here, the difference of 3rd and 5th digit from left is not equal to the 4th digit from the left. So, this cannot be the train number.
Option 3: 12775
As, all the digits are different. So, this cannot be the train number.
Option 4: 12734
Here, the difference of 3rd and 5th digit from left is equal to the 4th digit from the left. So, this must be the train number.
Hence, ‘12734’ is the correct answer.
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