Mathematics
Senior High
これはなぜC⊂Dなのでしょうか?
(2) C={2n+1|nは5以下の自然数}, D={4n-1|n=1, 2,3}
C:13.5.7.9.1
D = {3.7, A}
COD
Aff
CCD
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D⊂Cだと思うのですが...