AP EAMCET · Maths · Permutation Combination
There are identical white balls and identical black balls. The number of distinguishable arrangements in a row of all the balls, so that no two black balls are adjacent is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(C)
Step-by-step Solution
Detailed explanation
We will use Gap method to solve this. Firstly, 7 White balls can be arranged in 7! ways. But Since all balls are identical so it should be 7!7! ways. Now, A black ball can be between these white balls. So there are exactly 8 slots to place 3 black balls i.e.,…
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