If 4 questions from each section are selected Remaining 3 questions can be selected either in (1, 1,1) or (3,0,0) or (2,1,0) ‌∴‌ Total ways ‌=‌8c5⋅‌6c5⋅‌6c5+‌8c6‌6c5⋅‌6c4×2+‌‌8c5⋅‌6c6⋅‌6c4×2+‌8c4⋅‌6c6⋅‌6c5×2+‌8c7⋅‌6c4⋅‌6c4 ‌=56.6.6+28.6.15.2+56.15.2+70.6.2‌+8.15.15 ‌=2016+5040+1680+840+1800=11376