PPSC Past Paper Excise & Taxation Inspector D G Khan Region Excise, Taxation & Narcotics Control Department 2018 Solved MCQs, Maths MCQs, Number Series, PPSC Solved Past Papers MCQsComplete the number series: 3, 7, 6, 5, 9, 3, 12, 1, 15, __________? Posted on May 22, 2021 by Rana TahirA. 21 B. -3 C. -1 D. 13Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)