Group A: 1, 6, 7, 12, 13, 18 Group B: 2, 5, 8, 11, 14, 17 Group C: 3, 4, 9 Divide the natural numbers from 1 to 200 into ABC three groups. Group A: 1, 6, 7, 12, 13, 18 Group B: 2, 5, 8, 11, 14, 17 Group C: 3, 4, 9, 10, 15, 16 Please answer the questions according to the grouping rules. 1. There are () natural numbers in group B. 2. What is the 28th number in group A?

1. The general term of group B is 3n-1, 3 * 67-1 = 200, so the 67th number is 200, so there are 67 numbers in group B
2. In group A, the odd term is 3 (n-1) + 1, and the even term is 3N, so the 28th number is 3 * 28 = 84

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