programming R

EX 1) Implement the series 1 +1/2+1/3+1/4+1/5 using "for" loop in R 20 Ex 2) using "for" loop in R., Implement the series 1=1 Ex 3 Experiment with different ways of defining a function which calculates the following double sum for any value of n. n - 10+4 Hint: use for loop inside for loop