Class 11

Math

JEE Main Questions

Permutations and Combinations

In how many ways can 4 red, 3 yellow and 2 green discs be arranged in a row if the discs of the same colour are indistinguishable?

arrangement : RRRR YYY GG

total ways= $4!3!2!9! =6⋅29⋅8⋅7⋅6⋅5 $

$=63⋅20=1260$

answer