Carefully observe the arrangement rule of the sequence, and choose the correct one to make it conform to the arrangement rule of the original sequence: 4,38,18,10,4, () A：2 B：1 C：3

The answer is a

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1. Please find the sequence 18,34,55,81 , 1 / 2 [(n-3) (5N + 12)] + 18 Please find the sequence 18,34,55,81 , 1 / 2 [(n-3) (5N + 12)] + 18. The rule of this sequence is that the difference between them is an arithmetic sequence,
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15. 3, 9, 18, 30?
16. 1,-1,-2,3,-5,-8,13,（）,（）
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20. 1×12÷323÷1×4×2×2×0= 2×3×4×5×6×7×8×9×123÷6=