C-14-Q167mediumsingle_mcqa:b=2:3a:b=2:3a:b=2:3 হলে (2a+3b):(2a−3b)=?(2a+3b):(2a-3b)=?(2a+3b):(2a−3b)=?a−13:5-13:5−13:5b13:513:513:5c5:135:13