What are the respiratory organs of insects?
Insects breathe through a network of tubes called tracheae, which deliver oxygen directly to their tissues.
In how many ways 6 novels and 7 notebooks can be arranged in a row so that they are alternate?
Find the number of words that can be formed by using all letters of the word 'ESCAPE', if it starts with letter C and end with letter P.
A Consignment of 12 mobile phones contains 4 defectives. The mobile phones are selected at random one by one and examined. The ones examined are not pu...
In a party 19 persons shake hands with every other person. Find the total no of handshakes in the party?
In how many ways can 4 boys and 3 girls can be seated in a row so that they are in alternate position.
How many words can be formed from the word INCREASE in which both E’s do not come together?
In how many ways can the letters of the word ENGINEERING be arranged?
5 persons P, Q, R, S, and T are sitting around a round table. How many times can they sit in different ways so that Q and T do not sit together?
In how many different ways can the letters of the word ‘PUBLIC’ be arranged in such a way that the vowels occupy only the odd positions?
In how many different ways can the letters of the word QUANTITY be arranged so that the vowels always come together?
