The user must enter a number between $10$ and $20.$ What is the loop test to ensure a

valid number is entered?

n$=$ int $($input$("$Enter number in range $10.\mathrm{.}20$: $"))$

while $()$:

print $("$invalid number"$)$

n$=$ int $($input$"$Enter number in rang$10\mathrm{.}20$:$"))$

$n<mn>1</mn><mn>0</mn>$ or $n>20$

$n10$ and $n20$

$n10$ or $20$

$n<mn>1</mn><mn>0</mn>$ and $n>20$