A biased die is tossed and respective probabilities for various faces to turn up are the following : | Face | 1 | 2 | 3 | 4 | 5 | 6 | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Probability | 0.1 | 0.24 | 0.19 | 0.18 | 0.15 | K | Based on the above information, answer the following questions : (a) What is the value of K ? (b) If a face showing an even number has turned up, then what is the probability that it is the face with 2 or 4 ?