In how many ways can 15 different books be di | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) To divide $15$ different books into $5$ equal groups,each group will contain $15 / 5 = 3$ books.First,we calculate the number of ways to distribut

Vedclass · Accepted Answer

$1401400$

Vedclass · Answer

(B) To divide $15$ different books into $5$ equal groups,each group will contain $15 / 5 = 3$ books.First,we calculate the number of ways to distribute the books into $5$ distinct groups of $3$ each:Number of ways $= {}^{15}C_{3} 	imes {}^{12}C_{3} 	imes {}^{9}C_{3} 	imes {}^{6}C_{3} 	imes {}^{3}C_{3}$.Since the order of the $5$ groups does not matter (they are identical sets),we must divide by $5!$ to remove the permutations of the groups.Required number of ways $= \frac{{}^{15}C_{3} 	imes {}^{12}C_{3} 	imes {}^{9}C_{3} 	imes {}^{6}C_{3} 	imes {}^{3}C_{3}}{5!}$.Calculating the combinations:${}^{15}C_{3} = \frac{15 	imes 14 	imes 13}{3 	imes 2 	imes 1} = 455$.${}^{12}C_{3} = \frac{12 	imes 11 	imes 10}{3 	imes 2 	imes 1} = 220$.${}^{9}C_{3} = \frac{9 	imes 8 	imes 7}{3 	imes 2 	imes 1} = 84$.${}^{6}C_{3} = \frac{6 	imes 5 	imes 4}{3 	imes 2 	imes 1} = 20$.${}^{3}C_{3} = 1$.Total $= \frac{455 	imes 220 	imes 84 	imes 20 	imes 1}{120} = \frac{168168000}{120} = 1401400$.

In how many ways can $15$ different books be divided equally among $5$ sets or groups?

Similar Questions

How many words can be formed from the letters of the word $COURTESY$,whose first letter is $C$ and the last letter is $Y$?

Statement-$1$: The number of ways of distributing $10$ identical balls in $4$ distinct boxes such that no box is empty is $^9C_3$.
Statement-$2$: The number of ways of choosing any $3$ places from $9$ different places is $^9C_3$.

There are $4$ notes of Rs. $100$ and $5$ other notes of denominations Rs. $1$,Rs. $2$,Rs. $5$,Rs. $20$,and Rs. $50$. These notes are to be distributed among $3$ children such that each child receives at least one note of Rs. $100$. Find the total number of ways of distribution.

The product of any $r$ consecutive natural numbers is always divisible by

$A$ car can hold $2$ people in the front seat and $1$ person in the rear seat. If among $6$ persons $2$ can drive,then the number of ways in which the car can be filled is

Vedclass Test Series

Exam Paper Generator

Online Exam Module