context: ###List of Questions
  (1) Two letters picked without replacement from {u: 3, x: 8}. Give prob of sequence uu.
  (2) What is next in -39, -25, 23, 123, 293, 551, 915?
  (3) What is one fifth of a litre in millilitres?
  (4) Let a be 2/(3 + (-26)/10). Let x be ((-6)/a)/(6/(-320)). What is the units digit of x/6 - 3/(-9)?
  (5) What is -2 - (-2 + -1 - -2)?
q_1: (1) Two letters picked without replacement from {u: 3, x: 8}. Give prob of sequence uu.
q_2: (2) What is next in -39, -25, 23, 123, 293, 551, 915?
q_3: (3) What is one fifth of a litre in millilitres?
q_4: (4) Let a be 2/(3 + (-26)/10). Let x be ((-6)/a)/(6/(-320)). What is the units digit of x/6 - 3/(-9)?
q_5: (5) What is -2 - (-2 + -1 - -2)?