Question

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​

Answer 1

Answer:

9!/(4!+3!+2!) = 1260

Step-by-step explanation:

As they give the discs are repeating we use this formula = n!/(P1!.P2!.P3!)

where n = P1+P2+P3

Here P1 =4 ,P2=3, P3=2

n = 4+3+2 = 9

as we know the formula

so 9! / (4!.3!.2!) =1260

note n! is given as n×n-1×n-2×....×1