2 2 votes How many different words can be formed using all the letters of the word ALLAHABAD? (a) When vowels occupy the even positions. (b) Both L do not occur together. Mathematical Logic + – sumit goyal 1 2.3k views answer comment Share Follow Print See all 11 Comments 11 11 Comments reply Show 8 previous comments stblue commented Aug 21, 2017 reply Follow flag Yes yes true, when we talk about arrangement we count the word, and when we talk about rearrangement we exclude the given word. I will post another example from arun sharma, which will clear this concept. 0 0 replyShare abhishek tiwary commented Aug 30, 2017 reply Follow flag in case of "re -arrangement" we have to subtract 1 not arrangement 0 0 replyShare Shubhanshu commented Aug 30, 2017 reply Follow flag Subtracting 1 means we are excluding that one given arrangement from the total no of arrangements. 0 0 replyShare Please log in or register to add a comment.
Best answer 1 1 vote Here is an example from Arun sharma, Have a look stblue answered Aug 21, 2017 • selected Aug 21, 2017 by sumit goyal 1 stblue comment Share Follow See all 3 Comments 3 3 Comments reply sumit goyal 1 commented Aug 21, 2017 reply Follow flag thnks bro 0 0 replyShare rahul sharma 5 commented Aug 21, 2017 reply Follow flag Are you sure we subtract -1 ? I have not seen any such question except the example you posted 0 0 replyShare sumit goyal 1 commented Aug 21, 2017 reply Follow flag wo clear hgya , we dont have to subtract 0 0 replyShare Please log in or register to add a comment.