context: ###List of Questions
  (1) Let b = 42 - 19. Calculate the remainder when 112 is divided by b.
  (2) In base 11, what is -27 + -15a?
  (3) What comes next: 1072, 1071, 1070?
  (4) How many hours are there in 620.11656ms?
  (5) Three letters picked without replacement from okjllaaio. Give prob of sequence okl.
q_1: (1) Let b = 42 - 19. Calculate the remainder when 112 is divided by b.
q_2: (2) In base 11, what is -27 + -15a?
q_3: (3) What comes next: 1072, 1071, 1070?
q_4: (4) How many hours are there in 620.11656ms?
q_5: (5) Three letters picked without replacement from okjllaaio. Give prob of sequence okl.