Determining the output of dividing 1 by n in a concurrent Go program

It is necessary to understand what value will be printed by the program, where several goroutines call the function printNumber. Inside the function, a signal is sent to a buffered channel, there is a one-second pause, and the result of the expression 1 / n is printed. The program uses sync.WaitGroup to wait for all goroutines to finish and closes the channel after they are done.

package main

import (
    "fmt"
    "sync"
    "time"
)

func main() {
    wg := sync.WaitGroup{}
    ch := make(chan struct{}, 5)

    for i := 0; i < 10; i++ {
        wg.Add(1)
        go func() {
            defer wg.Done()
            printNumber(ch, i)
        }()
    }

    wg.Wait()
    close(ch)
}

func printNumber(ch chan struct{}, n int) {
    ch <- struct{}{}
    time.Sleep(time.Second)
    fmt.Println(1 / n)
    <-ch
}