Exercise 3: Write a Python program that reads from the user an integer n between 1 and 20, and then computes and prints all intermediary summations from 1 up to and including n. Where the ith...

Extracted text: Exercise 3: Write a Python program that reads from the user an integer n between 1 and 20, and then computes and prints all intermediary summations from 1 up to and including n. Where the ith intermediary sum is given by "1+2+...+i". Note that your program should display a suitable error message if n is located outside the range specified (1<>< 20).="" sum="==" 1="" 2="" 3="" 3="" 6="" 4="" 10="" figure="" 3-="" sample="" run="" for="" n="">