C-14-Q036mediumsingle_mcq△ABC\triangle ABC△ABC এ DE∥BCDE\parallel BCDE∥BC হলে AD=3, DB=2, AE=6AD=3,\ DB=2,\ AE=6AD=3, DB=2, AE=6 হলে EC=?EC=?EC=?a444b555c999d1212