(A)" category "-8,-6,-4,..." How many posts of "

Let A={1,2,3,4,5,6,7,8,9). How many subsets does A have which contain 4,5 and 6?

Define the term Hydride. How many categories of hydrides are known? Name them.

There are 6 candidates for 3 posts. In how many ways can the posts be filled?

How many numbers of 4 -digit greater than 6,000 can beformed with the digits 3,4,5,6, 8? (No digit is repeated in any number.) How many of these numbers so formed are odd?

On the basis of census, in how many categories have towns of India been divided ?

How many numbers of 4 digit greater than 6000 can be formed with the digits 3,4,5,6,8? (no digit is repeated in any number). How many of these numbers so formed.

A servant has to post 5 letters and there are 4 letter boxes in how many ways can he post the letter is