$4$

$.$

What will be the output of the following R code? f

$<$

$-$

function

$($

num

$=$

$1$

$)$

$$hello

$<$

$-$

"Hello world

$"$ for

$($

i in seq

$\_$

len

$($

num

$)$

$)$

$\{$

cat

$($

hello

$)$

$?$

$\}$

chars

$<$

$-$

nchar

$($

hello

$)$

$*$

$$num chars