please help solving Rstudio.

### Q$5$: Get the maximum and minumum value of a vector c$(3,-5,8,12,4,2,1,7).$

### Q$6$: Write a R program to print the numbers from $1$ to $50$ and print "Fizz" for multiples of $3,$ print "Buzz" for multiples of $5,$ and print "FizzBuzz" for multiples of both.

### Q$7.$ Write a R program to get the unique characters of the string "This is a challenging question". $($Whitespace can be counted as a unique character$)$