Explanation : Given, a bag contains 5 red marbles, 4 green marbles and 3 blue marbles. Total number of marbles = 12. Total number of non-green marbles =8 Here, total number of cases =12 and number of favourable cases = 8 .'. Probability of getting a non-green marble = Number of favourable cases/Total number of cases. = 8/12. = 2/3.
Explanation : Given, AB x BA = BCB. Here, we cannot take AB as 11 because from question A ≠ B ≠ C. If we take A = 1 and B = 2, then 12x21 = 252. From, here we can say that A = 1, B = 2 and C = 5 .'. A + B + C = 1 + 2 + 5 = 8.