Write a function problem1_3(n) that adds up the numbers 1 through n and prints out the result. You should use either a 'while' loop or a 'for' loop. Be sure that you check your answer on several numbers n. Be careful that your loop steps through all the numbers from 1 through and including n.

def problem1_3(n): sum=0 i=0 while i<=n: sum=sum+i i=i+1 print(sum) problem1_3(100) # put any number instead of 100