From a class of 25 students, 10 are to be chosen for an excursion party. There are 3 students who decide that either all of them will join or none of them will join. In how many ways can the excursion party be chosen?

From a class of 15 students,10 are to chosen for a picnic.There are two students who decide that either both will join or none of them will join.In how many ways can the picnic be organized?

From a class of 15 students, 10 are to be chosen. There are 3 students who decide that either all of them will select or non of them will select. In how many ways can they be chosen?

From a class of 25 students, 4 are to be chosen for a competition. In how many ways can this be done?

From a class of 32 students,4 are to be chosen for a competition.In how many ways can this be done?

From a class of 30 student , 3 are to be chosen for a competition . In how many ways can this be done ?

From a class of 40 students, in how many ways can five students be chosen (i) For an excursion party.

From a class of 12 boys and 10 girls,10 students are to be chosen for a competition; at leastincluding 4 boys and 4 girls.The 2 girls who won the prizes last year should be included.In how many ways can the selection be made?

From a class of 14 boys and 10 girls, 10 students are to be chosen for a competition, at least including 4 boys and 4 girls. The 2 girls who won the prizes last year should be included. In how many ways can the selection be made?

From a class of 12 girls and 15 boys, 12 students are to be chosen for a competition including 7 boys and 5 girls. The two girls and 3 boys who won the prizes last year should be included . In how many ways can the selection be made ?

A shop has 10 type of sweets.In how many ways 6 pieces of sweet can be chosen?