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## Homework Statement

Prove the intervals of real numbers (1,3) and (5,15) have the same cardinality by finding an appropriate bijective function of f:(1,3) ->(5,15) and verifying it is 1-1 and onto

## Homework Equations

I know there are multiple ways to prove one to one and onto im not sure

which one to use

However, what do i do to prove that cardinality are both infinite?

## The Attempt at a Solution

Assume the intervals (1,3) and (5,15)