Help me please!

Given: B = (3.5, 3.7, 5.0, 10.6, 25.3, 50.6) a. What is wrong with: B[3] = 10.6 ? b. Write output for: print('Slice sum {mySum: 06.2f}'.format (mySum=sum (B[-3:1:-1]))) c. Write an equivalent line of code to the above print statement using all positive numbers for slicing. d. Is a, b, c = B[-1:-5:-1] allowed? e. If d. is allowed, what is the value of b? If d. is not allowed, correct the statement (by changing only one character) and tell the value of b