Following is a matrix of certain entries. The entries follow a certain trend row-wise. Choose the missing…
Following is a matrix of certain entries. The entries follow a certain trend row-wise. Choose the missing entry (?) accordingly.
Row 1: 7B, 10A, 3C
Row 2: 3C, 9B, 6A
Row 3: 10A, 13C, ?
9B
3A
3B
3C
Solution
From one row to the next the letters shift cyclically: BAC to CBA to ACB. For the numbers, the third entry equals the difference of the second and first: $10 - 7 = 3$, $9 - 3 = 6$, $13 - 10 = 3$. So the number is 3 and the letter is B, giving 3B.