Questions
Three boys of class X, four boys of class XI, and five boys of class XII sit in a row. The total number of ways in which these boys can sit so that all the boys of same class sit together is equal to
detailed solution
Correct option is A
We can think of three packets. one consisting of three boys of class X, other consisting of 4 boys of class XI and last one consisting of 5 boys of class XII. These packets can be arranged in it ways and contents of these packets can be number arranged in 31 4! and 5 ! ways, respectively. Hence, the total number of ways is 3 !x 3 ! x 4! x 5 !Similar Questions
The total number of 5-digit numbers of different digits in which the digit in the middle is the largest is
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