Basic Concept of Permutations and Combination

10 examination paper are arranged in such a way that the best and worst papers never come together. The number of arrangement is

priya dhanba

priya dhanba

CA Foundation


22-Feb-20 22:01


Answers (1)

First find out total number of ways to arrange 10 papers. Then find out number of ways in which both are always together i.e. considering best and worst papers as one unit. Subtract 2 from 1.

Suraj Lakhotia

Suraj Lakhotia


23-Feb-20 10:57