In how many ways can 7 distinct red balls and 5 distinct blue balls be placed in a row such that all red balls are adjacent,

Question

Jadyn Wang

Mathematics

10 January, 10:23

In how many ways can 7 distinct red balls and 5 distinct blue balls be placed in a row such that all red balls are adjacent,

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Answers (1)

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Araceli Kramer · Answer 1

The blue can be placed before the red or the red before the blue.

7 distinct balls have a permutation of 5040 while 5 distinct balls have a permutation of 120.

Each permutation of the reds can be combined with each permutation of the blues giving 5040*120=604800.

Double this to 1209600 to allow for the two positioning for red and blue.