In this section you can learn and practice Aptitude (Questions with Answers) to improve your skills in order to face the interview, competitive examination and various entrance test (CAT, GATE, GRE, MAT, Bank Exam, Railway Exam etc.) with full confidence.
XtraStudy provides you lots of fully solved Aptitude questions and answers with explanation. Solved examples with detailed answer description, explanation are given and it would be easy to understand. You can view the solutions for the problems with feel and good user interface.
You can easily solve all kind of questions based on Aptitude by practicing exercise given in this APTITUDE section.
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|nPr = n(n - 1)(n - 2) ... (n - r + 1) =||n!|
|Then, number of permutations of these n objects is =||n!|
|nCr =||n!||=||n(n - 1)(n - 2) ... to r factors||.|
|(r!)(n - r)!||r!|
|i. 11C4 =||(11 x 10 x 9 x 8)||= 330.|
|(4 x 3 x 2 x 1)|
|ii. 16C13 = 16C(16-13) = 16C3 =||16 x 15 x 14||=||16 x 15 x 14||= 560.|
|3!||3 x 2 x 1|