Show that the set has cardinal number ?0 by establishing a one-to-one correspondence between the natural numbers and the given set. Be sure to indicate the general correspondence.

A.

1,2,3,4,  5, ..., n, ...
? ?
  ,  ,  ,  ,  , ...,  , ...
B.
1,2,3,4,  5, ..., n, ...
?? ? 
  ,  ,  ,  ,  , ...,  , ...
C.
1,2,3,4,  5, ..., n, ...
?? ?
  ,  ,  ,  ,  , ...,  , ...
D.
1,2,3,4,  5, ..., n, ...
? ? 
  ,  ,  ,  ,  , ...,  , ...


Answer: C

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