If in the number $8367542741$, 1 is added to the digits at even positions and 1 is subtracted from the digits at odd positions when counted from the l...
Question
If in the number $8367542741$, 1 is added to the digits at even positions and 1 is subtracted from the digits at odd positions when counted from the left, what is the sum of the 2nd, 4th, 7th, and 9th digits of the new number formed?