Three ships A, B, and C sail from England to India. If the ratio of their arriving safely are 2;5, 3:7 , and 6: 11,  respectively, then the probability of all the ships for arriving safely is

The ratios of the ships A, B, and C for arriving safely are 2:5, 3:7 , and 6: 11, respectively. Therefore, the probability of ship A for arriving safely is  2(2 + 5) - 217.Similarly, for B the probability is 3(3 + 7) = 3110 and for C the probability is C= 6 (6 + 1 1) = 6/17 .Therefore, the probability of all the ships for arriving safely is (2/7) x (3/10) x (6/17) = 18/595.