context: ###List of Questions
  (1) What is prob of sequence gw when two letters picked without replacement from rrrrwggrwprg?
  (2) What is 85.89907t in micrograms?
  (3) Suppose 3*p + 3*c - 24 = 0, -4*p - 10 + 42 = -3*c. Solve 4*a + o + p - 20 = 0, 3*o + 12 = 0 for a.
  (4) Let p(s) be the first derivative of s**3/3 + s**2 + 3. Let v be p(-2). What is the units digit of 11/(-1)*(v + -1)?
  (5) Calculate 2 + 2 - (-16 - -16).
q_1: (1) What is prob of sequence gw when two letters picked without replacement from rrrrwggrwprg?
q_2: (2) What is 85.89907t in micrograms?
q_3: (3) Suppose 3*p + 3*c - 24 = 0, -4*p - 10 + 42 = -3*c. Solve 4*a + o + p - 20 = 0, 3*o + 12 = 0 for a.
q_4: (4) Let p(s) be the first derivative of s**3/3 + s**2 + 3. Let v be p(-2). What is the units digit of 11/(-1)*(v + -1)?
q_5: (5) Calculate 2 + 2 - (-16 - -16).