There are unlimited number of identical balls of four different colours How many arrangements of at the most 8 - Maths -

Question

There are unlimited number of identical balls of four different
colours How many arrangements of at the most 8 balls in a row can
be made by using them?

Tanuj Goswami · Answer

I think this a correct approach
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There are unlimited number of identical balls of four different colours. How many arrangements of at the most 8 balls in a row can be made by using them?