The first letter of an element always written in _______ letter.

The first letter of a symbol of an element is always written as a _______ letter and second letter as a _______ letter.

10 different letters of an alphabet are given. Words with 5 letters are formed from these given letters then the numbers of words which have atleast one letter represent is:

The number of four-letter words that can be formed (the words need not be meaningful) using the letters of the word MEDITERRANEAN such that the first letter is E and the last letter is R, is

The letters of word ZENITH are written in all possible ways. If all these words are written out as in a dictionary, then find the rank of the word ZENITH.

Number of nine-lettered word that can be formed using all the letters of the word 'MEENANSHU' if alike letters are never adjacent is

Find the number of strings of 4 letters that can be formed with the letters of the word EXAMINATION.

How many words, with or without meaning , can be made from the letters of the word MONDAY, assuming that no letters is repeated , if (i) 4 letters are used at a time (ii) all letters are used at a time