But when you swap the spreadsheets for the Premier League table, it’s clear something doesn’t add up. In fact, by the time United arrives at Old Trafford to face Arsenal on Monday it could already be out of the title race — if it was really in it to start with. Last season it finished sixth, 32 points behind champion Manchester City and 32 ahead of Cardiff, the team occupying the final relegation place. After a mere six games of this fledgling Premier League season, United is already 10 points adrift of league leader Liverpool — by Monday it could be 13. “I never said it was going to be easy this season,” United coach Ole Gunnar Solskjaer told reporters Friday. “There are going to be bumps in the road, ups and downs, highs and lows – when we lose a game we have to trust ourselves and what we are doing, keep our eyes on the prize and the principles we believe in.” Those bumps do not look like they’ll be subsiding any time soon. On Wednesday, United required a penalty shootout to defeat third-tier Rochdale in the English League Cup after the contest finished 1-1 after 90 minutes….