How many prisoners in jails were denied right to vote in the elections of 2018?

How many prisoners in jails were denied right to vote in the elections of 2018?

2018 کے انتخابات میں جیلوں میں کتنے قیدیوں کو ووٹ کے حق سے محروم کیا گیا؟
Explanation

 In the 2018 general elections in Pakistan, approximately 80,000 prisoners across the country were denied their right to vote.