In how many National and Provincial Constituencies by elections were held on 15th October 2018?

None of these

Elections for the National/Provincial Assemblies' 37 Constituencies On 14 October 2018.

By-elections are scheduled to be held in Pakistan on 14 October 2018 and 21 October 2018.

These elections will be held in 12 constituencies for the National Assembly of Pakistan

And 27 constituencies belonging to the four provincial assemblies of Pakistan