From 10 candidates how many selections of 5 can be made so as to
include both the youngest and the oldest

From 10 candidates how many selections of 5 can be made so as to exclude the youngest if it includes the oldest ?

From 10 boys and 6 girls , how many different selections can be made so as to include at least one boy and one girl ?

From 8 boys and 5 girls , how many different selections of 5 members can be made so as to include at least one boy and one girl ?

How many selection of 4 books can be made from 8 different books?

How many selection of 4 books can be made from 8 different books?

How many selections of 4 books can be made from 8 different-books ?

From 4 mangoes, 5 oranges and 6 apples, how many selections of fruits can be made by taking at least one of them ?

From 4 mangoes,5 oranges and 6 apples,how many selections can be made by taking at least one of them?

How many cubes of side 5 cm can be made from a solid cube of side 10 cm ?