First Grade Challenging Math

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1-3)   Answers

a)   17, 15, 13, 11, 9, 7, 5, 3, 1

b)   1, 2, 2, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 2, 8, 2

c)   6, 11, 16, 21, 26, 31, 36, 41