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.{3, 6, 9, 12, ...}
A.
| 1, | 2, | 3, | 4, | ..., | n, | ... |
| ? | ? | ? | ? | ? |
| 3, | 6, | 9, | 12, | ..., | n, | ... |
B.
| 0, | 1, | 2, | 3, | ..., | n, | ... |
| ? | ? | ? | ? | ? |
| 3, | 6, | 9, | 12, | ..., | 3n, | ... |
C.
| 1, | 2, | 3, | 4, | ..., | n, | ... |
| ? | ? | ? | ? | ? |
| 3, | 6, | 9, | 12, | ..., | 3n, | ... |
D.
| 1, | 2, | 3, | 4, | ..., | n, | ... |
| ? | ? | ? | ? | ? |
| 3, | 6, | 9, | 12, | ..., | 4n, | ... |
Answer: C
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B. 
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? 0
A. (-?, -1] or 
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C. (-2, -1] or 
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The probability density function of X is f (x) = 5 x6 over [1, ?)
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