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?

Explanation

To solve the problem of arranging 4 red, 3 yellow, and 2 green discs in a row, we can use the formula for permutations of multiset. The formula is given by:

\[ \text{Number of arrangements} = \frac{n!}{n_1! \times n_2! \times n_3!} \]

where:
- \( n \) is the total number of items to arrange,
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