Engineering
Mathematics
Permutation and Combination Basic Definitions
Question
From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on a shelf so that the dictionary is always in the middle. The number of such arrangements is:
Know your College Admission Chances Based on your Rank/Percentile, Category and Home State.
Get your JEE Main Personalised Report with Top Predicted Colleges in JoSA
Solution
6N and 3D
no. of ways = 6C4 × 3C1 × 4!
= 15 × 3 × 24 = 1080.