One day, I was helping my son with his homework. One of the questions is about the pattern. There listed some numbers and let you to find the next number. When the first few are 21, 24, 27, 30, 33, and I said the next should be 36. My son asked me, why? I told him that the differences of the two numbers are 3. He asked me, I ... More..
Denny Wang
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