{"id":6765,"date":"2021-10-21T14:03:25","date_gmt":"2021-10-21T08:33:25","guid":{"rendered":"https:\/\/mathemerize.com\/?p=6765"},"modified":"2021-10-25T01:33:22","modified_gmt":"2021-10-24T20:03:22","slug":"if-all-the-letters-of-the-word-rapid-are-arranged-in-all-possible-manner-as-they-are-in-a-dictionary-then-find-the-rank-of-the-word-rapid","status":"publish","type":"post","link":"https:\/\/mathemerize.com\/if-all-the-letters-of-the-word-rapid-are-arranged-in-all-possible-manner-as-they-are-in-a-dictionary-then-find-the-rank-of-the-word-rapid\/","title":{"rendered":"If all the letters of the word ‘RAPID’ are arranged in all possible manner as they are in a dictionary, then find the rank of the word ‘RAPID’."},"content":{"rendered":"
First of all, arrange all letters of given word alphabetically : ‘ADIPR’<\/p>\n
Total number of words starting with A _ _ _ _ = 4! = 24<\/p>\n
Total number of words starting with D _ _ _ _ = 4! = 24<\/p>\n
Total number of words starting with I _ _ _ _ = 4! = 24<\/p>\n
Total number of words starting with P _ _ _ _ = 4! = 24<\/p>\n
Total number of words starting with R A D _ _ = 2! = 2<\/p>\n
Total number of words starting with R A I _ _ = 2! = 2<\/p>\n
Total number of words starting with R A P D _ = 1 = 1<\/p>\n
Total number of words starting with R A P I _ = 1 = 1<\/p>\n
Therefore, Rank of the word RAPID = 24 + 24 + 24 + 24 + 2 + 2 + 1 + 1 = 102<\/p>\n
How many different words can be formed by jumbling the letters in the word \u2018MISSISSIPPI\u2019 in which no two S are adjacent ?<\/a><\/p>\n From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on the shelf so that the dictionary is always in the middle. Then, the number of such arrangements is<\/a><\/p>\n There are 10 points in a plane, out of these 6 are collinear. If N is the number of triangles formed by joining these points, then<\/a><\/p>\n Let \\(T_n\\) be the number of all possible triangles formed by joining vertices of an n-sided regular polygon. If \\(T_{n+1}\\) \u2013 \\(T_n\\) = 10, then the value of n is<\/a><\/p>\n