Ten students have been nominated for aPS.. a students' council executive. Five of the nominees are from grade 12, three are

• b1° from grade 11, and the other two are from grades 9 and 10.

In how many ways could the nominees fill the positions of president and vice-president if all ten are eligible for these senior positions? How many ways are there to fill these positions if only grade 11 and grade 12 students are eligible?