context: ###List of Questions
  (1) How many decades are there in six fifths of a millennium?
  (2) Calculate prob of sequence lc when two letters picked without replacement from rrrclrhm.
  (3) Suppose 0 = 2*b - 16 + 6. Suppose -2*p - p = -39. Suppose 98 = b*n + p. What is the remainder when 33 is divided by n?
  (4) What is the value of (9/((-495)/(-4)))/(2/5)?
  (5) What is next in -171, -327, -483?
q_1: (1) How many decades are there in six fifths of a millennium?
q_2: (2) Calculate prob of sequence lc when two letters picked without replacement from rrrclrhm.
q_3: (3) Suppose 0 = 2*b - 16 + 6. Suppose -2*p - p = -39. Suppose 98 = b*n + p. What is the remainder when 33 is divided by n?
q_4: (4) What is the value of (9/((-495)/(-4)))/(2/5)?
q_5: (5) What is next in -171, -327, -483?