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    6.  Do as directed.                                                                            4×2.5=10
                        a. Write a Python program to print the following series:

                          1 4 7 10 ........... 40.
                        b. Write a Python script that prompts the user to input a length in centimeters. If the user enters
                           a negative value, the program should display a message indicating that the entry is invalid.
                           Otherwise, it should convert the length to inches and display the result. (Note: 1 inch equals 2.54
                           centimeters.)
                        c. Write a Python script to get the following output:

                          5 × 1 = 5
                          5 × 2 = 10
                          5 × 3 = 15

                          5 × 4 = 20
                          5 × 5 = 25

                        d. Write a Python script to solve the following quadratic equation:
                              2
                          ax  + bx + c = 0.
                          where the values of a, b, c, and x are 5, 4, 3, and 7.

                                                                                       Half-Yearly Examination Sample Paper  161

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