Complete the sentences to explain what steps were followed to obtain the system of equations below. To get system B, the FIRST, SECND equation in system A was replaced by the sum of that equation and 3, 9, -9, -3 times the FIRST, SECOND equation. The solution to system B IS NOT, IS the same as the solution to system A.

Exclude leap years from the following calculations. (a) compute the probability that a randomly selected person does not have a birthday on october 4. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability that a randomly selected person does not have a birthday on the 1st day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability that a randomly selected person does not have a birthday on the 30th day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (d) compute the probability that a randomly selected person was not born in january. (type an integer or a decimal rounded to three decimal places as needed.)