Tag - permutation

[Aptitude] Permutation Combination made easy without Formulas

If the following questions make you uncomfortable, then read this article. In how many ways can 5 member committee be formed out of 20 students? Or How many ways can the word “UPSC” be arranged so that “U” is always second from left. In [...]

[Aptitude] Probability Made Easy (Extension of Permutation Combination Concept!)

Introduction Case1 : Probability of Particular Actor getting selected Case 2: Probability of One lady getting selected Case 3: One man and one woman (“AND” case) Case 4: “Atleast” one man is selected (“OR” case) Alternative method: 1 Minus Case 5: Probability of [...]

[Aptitude] PnC: How many Ways to arrange letters of word “RECUPERATE” (Permutation without Formulas)

When you form words using alphabets (or letters), the ‘order’ matters. Three alphabets T,A,C Now you form words: CAT is not same as ACT; both words have different meanings hence order matters. This is a permuation problem. Case 1: All letters are different Case 2: Word [...]

[Aptitude] PnC: All possible numbers using 012345, All possible words using ABCDE, Permutation Arrangement Made Easy with and without Formulas

Following types of questions pretty common in competitive exams: How many numbers of five digits can be formed with the digits 1,2,3,4 and 5, without repetition? How many words can be formed using all of the letters from A to E without repetition? How [...]