in how many ways can 4 green, 3 red and 2 yellow discs be arranged in a row if the discs of the same color are indistinguishable?
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Answer:
1260 ways
Step-by-step explanation:
Number of red discs = 3
Number of yellow discs = 2
Number of green discs = 4
Total number of discs = 9
Total number of arrangements = Number of arrangements of 9 things of which 3 are similar to the first kind, 2 are similar to the second kind and 4 are similar to the third kind = 9!
_________
4! × 3! × 2!
= 1260
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