For each problem, display the equation used to form the answer. Leave combinations, permutations, factorials, and exponents intact Good example: C(6, 3)-C(5,2-10 Bad examples: 10 no equation did not leave combinations intact 20-10= 10 If the final equation is too complex, introduce variables and break it down into two or more equations You are encouraged to show additional work to indicate how you derived your equation 1.(4 points, 1 point each) How many strings of seven capital letters are there.. a. if letters can be repeated? b. if no letter can be repeated? c. if the string starts with Q and letters can be repeated? d. if the string starts with Q and letters cannot be repeated