Total Number Of Combination

You are given three classes of letters.(a_(1),a_(2),a_(3),a_(4));(b_(1),b_(2),b_(3)) and (c_(1),c_(2)). The total number of combinations which can be made with these letters when no two of the same class enter into any combination is:

STATEMENT-1 :The total number of combinations of n thing by taking some or all is 2^(n) . STATEMENT -2 : 5 identical balls can be distributed among 10 identical boxes in only one way if not more than one ball can go into a box. STATEMENT-3 : In the permutations of n things taken r at a time , the number of permutations in which m particular things occur together is ""^(n - m)P_(r - m) * ""^(r)P_(m)

The distributions X and Y with total number of observations 36 and 64, and mean 4 and 3 respectively are combined. What is the mean of the resulting distribution X + Y?

Total number of conformation of ethane is :

The total number of conformations of ethane is:

The total number of propositions in 'The Element' are

Total number of relations

Total number of vertebra in Man :-