context: ###List of Questions
  (1) Calculate prob of sequence rkk when three letters picked without replacement from {r: 12, k: 3}.
  (2) What is next in -262, -266, -270, -274, -278, -282?
  (3) Let w(d) be the first derivative of d**4/4 + d**3/3 - 9. Let o be (1 + 1)*3/6. What is the units digit of w(o)?
  (4) What is twenty-six fifths of a millennium in months?
  (5) Evaluate (1130/226)/(5/(-4)).
q_1: (1) Calculate prob of sequence rkk when three letters picked without replacement from {r: 12, k: 3}.
q_2: (2) What is next in -262, -266, -270, -274, -278, -282?
q_3: (3) Let w(d) be the first derivative of d**4/4 + d**3/3 - 9. Let o be (1 + 1)*3/6. What is the units digit of w(o)?
q_4: (4) What is twenty-six fifths of a millennium in months?
q_5: (5) Evaluate (1130/226)/(5/(-4)).