Permutation and CombinationMedium
Question
A set contains (2n + 1) elements. The number of subset of the set which contain at most n elements is : -
Options
A.2n
B.2n+1
C.2n-1
D.22n
More Permutation and Combination Questions
If a, b, c, d, e are prime integers, then the number of divisiors of ab2c2de excluding 1 as a factor, is -...Four dice are rolled. The number of possible outcomes in which at least one die shows 2 is-...The total number of donations which can be given from 5 one rupee coins and 4 fifty paise coins, is (at least one coin m...In how many ways can 21 identical white and 19 identical black balls be put in a row so that no two black balls are toge...Eight chairs are numbered from 1 to 8. Two women and three men wish to occupy one chair each. First women choose the cha...