New Delhi, Nov. 4 -- India's services sector activity expanded at its fastest pace in four months in October, with the HSBC India Services Purchasing Managers' Index (PMI) rising to 55.8 from 55.2 in September, while input cost inflation eased to its lowest level in more than six years, according to data released by S&P Global on Wednesday.

The seasonally adjusted Business Activity Index remained comfortably above the 50-point mark that separates expansion from contraction, indicating stronger growth in output and new business.

Demand conditions, new client wins and successful advertising supported the increase in activity, with sales recording their fastest growth since June.

The easing of cost pressures provided some relief to servic...