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

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

How many words, with or without meaning can be made from the letters of the word MONDAY, assuming that no letter is repeated, if, all letters are used but first letter is a vowel?

How many words, with or without meaning, can be formed using all the letters of the word EQUATION, using each letter exactly once?

The number of words that can be formed with or without meaning using the letters of the word 'MONDAY', when no letter is repeated is:

How many 4-letter words, with or without meaning, can be formed out of the letters of the word, ‘LOGARITHMS’, if repetition of letters is not allowed ?

How many words, with or without meaning, can be formed using all the letters of the word EQUATION at a time so that the vowels and consonants occur together?