Q.1. Direction for Q1-4: The following table represents the addition of two six-digit numbers given in the first and the second rows, while the sum is given in the third row. In the representation, each of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 has been coded with one letter among A, B, C, D, E, F, G,H, J, K, with distinct letters representing distinct digits. Which digit does the letter A represent?

Q.2. Which digit does the letter B represent?

Q.3. Which among the digits 3, 4, 6, and 7 cannot be represented by the letter D?

Q.4. Which among the digits 4, 6, 7, and 8 cannot be represented by the letter G?

Q.5. Direction for Q5-9: There is a group of six students M, N, O, P, Q and R in a class. Each of the six students opts for two subjects, one compulsory and the other optional subject. P's optional subject was Geography while three others have it as a compulsory subject. Q and R have Chemistry as one of their subjects. R's compulsory subject is Physics which is an optional subject of both O and Q. Geography and English are M's subjects, as compulsory and optional respectively. Biology is an optional subject of only one of them. The only female student in the group is the one who has Geography as the optional subject and English as the compulsory one. Who is the female student in the group?

Q.6. Which of the following have the same "compulsory/optional" set as that of R?

Q.7. What is the compulsory subject of 'O'?

Q.8. Which of the following groups of students have Geography as their compulsory subject?

Q.9. Disregarding which is compulsory and which is the optional subject, who has the same combination as that of R?

Q.10. How many pairs of letters are there in the word ‘CHILDREN’ such that each pair has as many letters between them in the word ‘CHILDREN’ as they have in the English alphabet series?