If ‘365’ means ‘I am happy’; ‘748’ means ‘you are sad’ and ‘469’ means ‘happy and sad’ in a given code,…

Comparing the third code ('469' = 'happy and sad') with the first two codes: 1. Comparing '365' ('I am happy') and '469' ('happy and sad'), the common word is 'happy' and the common digit is '6'. Therefore, '6' stands for 'happy'. 2. Comparing '748' ('you are sad') and '469' ('happy and sad'), the common word is 'sad' and the common digit is '4'. Therefore, '4' stands for 'sad'. 3. In '469' ('happy and sad'), since '6' = 'happy' and '4' = 'sad', the remaining digit '9' must represent 'and'. Thus, “9” is the correct answer, while “3”, “6” and “4” represent other words.