Polling progressed at a brisk pace in the R K Nagar assembly constituency here, with an estimated 41 per cent of the electorate casting their votes by 1 PM in the prestigious by-election. Election authorities said 41.6 per cent of the 2,28,234 voters in the constituency exercised their franchise by 1 PM and there were no reports of any untoward incident so far. A few issues related to Electronic Voting Machines (EVMs) were immediately sorted out and polling was "brisk", they said.