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

Explanation

(i) `.^6P_4= 6*5*4*3 = 30*12=360`

(ii) `.^6P_6= 6! = 720`

(iii) `2.^5P_5`

`= 2*5! = 2*120 = 240`

answer