Solve each item carefully. Show your complete solution.

2. In how many ways can Ping Lacson, Bongbong Marcos, Isko Moreno, Manny Pacquiao, and Leni Robredo be seated in a round table if

a. there are no restrictions.

b. Leni and Manny must be always side by side

c. Leni and Bongbong refuse to sit next to each other

d. all males must be sitting next to each other e. Isko must always be seated to the right of Ping​