On a six sided die each side has a number between 1 and 6. What is the probability of throwing a 3 or a 4?

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

How do you solve a question like this?