Bunuel wrote:

Anna has 10 marbles: 5 red, 2 blue, 2 green and 1 yellow. She wants to arrange all of them in a row so that no two adjacent marbles are of the same color and the first and the last marbles are of different colors. How many different arrangements are possible?

A. 30

B. 60

C. 120

D. 240

E. 480

It is not mentioned that The marbles are identical. They may have the same color but it may be possible that they have different numbers or something different that makes each arrangement unique, so in that case the solution changes.

My doubt is if it is not explicitly mentioned that the marbles are identical then should we assume they are? (i mean looking at the answer options it suggest that balls are identical)

I know its a not a good query but Kindly suggest a solution

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