In the following question, a matrix of certain characters is given. These characters follow a certain trend, row-wise or column-wise. Find out this trend and choose the missing character accordingly.
?
13
49
9
17
69
13
11
59
Answer: A. 5
In the second row, 2 x 9 + 3 x 17 = 18 + 51 = 69. In the third row, 2 x 13 + 3 x 11 = 26 + 33 = 59. Let the missing number in the first row be y. Then, 2y + 3 x 13 = 49 or 2y = 10 or y = 5.