Which statements describe a parallelogram that must be a rhombus? Select each correct answer.
1.parallelogram with congruent diagonals
2.parallelogram with a right angle
3.parallelogram with perpendicular diagonals
4.parallelogram with opposite sides congruent
5.parallelogram with a pair of congruent consecutive sides​

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.)