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.
6 6 8
5 7 5
4 3 ?
120 126 320

Answer: B. 8

Clearly, (1st row) x (2nd row) x (3rd row) = 4th row.
In the first column, 6 x 5 x 4 = 120
In the second column, 6 x 7 x 3 = 126.
Let the missing number in the third column be y.
Then, 8 x 5 x y = 320 or y = 8.