In this video, we will learn an important concept of restricted selection i.e. to arrange n objects in r places where r is less than n, some object can occupy only certain places.

Questions Discussed

JEE Main Architecture 2015

In a car with seating capacity of exactly five persons, two persons can occupy the front seat and three persons can occupy the back seat. If amongst the seven persons, who wish to travel by this car, only two of them know driving, then the number of ways in which car can be fully occupied and driven by them, is

(A) 360 (B) 60 (C) 240 (D) 720

Answer: (D)

JEE Main Architecture 2016

A code word of length 4 consists of two distinct consonants in the English alphabet followed by two digits from 1 to 9, with repetition allowed in digits. If the number of code words so formed ending with an even digit is 432 k, then k is equal to

(A) 7 (B) 5 (C) 49 (D) 35

Answer: (D)

TRY YOURSELF Questions

8 oar boat is to be manned from a crew of 11 people out of which (figure given in the video)

3 can steer the boat but cannot row

8 can row the boat but cannot steer

In how many different ways, staff can be arranged on the boat so that 2 fixed people (A, B) can work on the bow side only and 6 can work anywhere?

Answers: 25920

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Permutation and combination IIT JEE Main + Advanced, Permutation and Combination IIT JEE Mathematics, Concept of Arrangement, Number of ways to arrange n different objects in n places, Permutation and Combination IIT JEE Questions, counting using Permutations, arranging n object in n places such the r objects are always together, number of way to arrange such that a number of objects are always consecutive, Number of ways to arrange identical objects, number of way to arrange such that a number of objects are always separated, no two girls are together, no two vowels are together, no two boys are together, no two consonants are together, Counting the number of triangles, how to count number of triangles

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Number of ways in which 5 different rings can be put on 4 fingers of hand??

Plz tell

sir please send me try ur self question solution

how to do your practice ques in part 9 p&c plz provide soln

thank you sir. plz upload diffential calculus problem asked in previous year in jee mains papar .