How many words (with or without dictionary meaning) can be made from the letters of the word MONDAY, assuming that no letter is repeated, if

Explanation

(i) 4 letters are used at a time `= ""^(6)P_(4) = (6"!")/(2"!") = 6 xx 5 xx 4 xx 3 = 360`
(ii) All letters used at a time `= 6"!" = 6 xx 5 xx 4 xx 3 xx 2 xx 1 = 720`
(iii) All letters used but first is vowel `= 2xx 5"!" = 2 xx 5 xx 4 xx 3 xx 2 xx 1 = 240`