context: ###List of Questions
  (1) What is prob of picking 3 o and 1 p when four letters picked without replacement from pooooopppppoo?
  (2) 10/(-60) + 14/(-24)
  (3) What comes next: 35, 146, 331, 590, 923, 1330?
  (4) Calculate the least common multiple of 21 and (-3 - 7/(-2))*10.
  (5) How many millilitres are there in 25/8 of a litre?
q_1: (1) What is prob of picking 3 o and 1 p when four letters picked without replacement from pooooopppppoo?
q_2: (2) 10/(-60) + 14/(-24)
q_3: (3) What comes next: 35, 146, 331, 590, 923, 1330?
q_4: (4) Calculate the least common multiple of 21 and (-3 - 7/(-2))*10.
q_5: (5) How many millilitres are there in 25/8 of a litre?