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Difference with useCallback()

Unlike the return value of a call to a callback passed to useCallback, the return value of the callback passed to useMemo is memoized.
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function Example(){
   const [a,setA] = React.useState(0);
   const m = React.useMemo(() => Math.random(),[]);
   const n = React.useCallback(() => Math.random(),[]);
   setTimeout(()=>{setA(a=>a+1);},1000);
   return (<React.Fragment>
                 <button>{m} (static)</button>
                 <button>{n()} (changing)</button>
              </React.Fragment>);}ReactDOM.render(<Example/>,document.querySelector("div"));