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6. Fill in the missing numbers from these sequences:
(a) 29 , 37 , 45, 61,
(b) 31, 28.5, 26, , , 18.5
20. Twelve balls labelled 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 are placed in a bag and one ball is chosen at random.
(a) Circle which of the following is more likely:
(b) Explain your answer clearly: