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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