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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

