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15 October, 04:02

Let EIF be the set of all natural numbers ending in 5. That is, EIF = {5, 15, 25, 35, 45, 55, 65, 75,.}.

Describe a one-to-one correspondence between the set of natural numbers and the set of EIF.

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  1. 15 October, 04:15
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    N={1,2,3,4,5,6, ... }

    ElF={5,15,25,35,45,55,65,75 ... }

    so let natural numbers to be n, so

    a) count the distance between the numbers

    b) add or subtract extra values

    10n-5 would be one to-one correspondence.
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