H. W1: - Write a program to find the summation of n terms from the following series. x2 x6 Sum .... to n term y11 H. W2: - Write a program to find the summation of the following series. Sum = 5+112² + 175 + 237 + 299

1. Use if - else elif Read 4 numbers from the user and check the following. () If the 15t number is less than 2n number, print cube of both the numbers. (i) If the 2nd number is more than 3° number, print the square of both the numbers. (ii) Otherwise print ('Four numbers')

(Financial: credit card number validation) Credit card numbers follow certain pat- terns. A credit card number must have between 13 and 16 digits. It must start with: 4 for Visa cards 5 for Master cards 37 for American Express cards 6 for Discover cards In 1954, Hans Luhn of IBM proposed an algorithm for validating credit card numbers. The algorithm is useful to determine whether a card number is entered correctly or whether a credit card is scanned correctly by a scanner. Credit card numbers are generated following this validity check, commonly known as the Luhn check or the Mod 10 check, which can be described as follows (for illustra- tion, consider the card number 4388576018402626): 1. Double every second digit from right to left. If doubling of a digit results in a two-digit number, add up the two digits to get a single-digit number. 4388576018402626 → 2 * 2 = 4 → 2 * 2 = 4 → 4 * 2 = 8 → 1 * 2 = 2 6 * 2 = 12 (1+ 2 = 3) → 5 * 2 = 10 (1+ 0 = 1) → 8 * 2 = 16 (1 + 6 = 7) → 4 * 2 = 8