UGC NET Dec-2020 and June-2021 Paper-2
October 9, 2023Flip-flops
October 9, 2023Nielit Scientist-B 17-12-2017
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Question 14
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In how many ways 8 girl and 8 boys can sit around a circular table so that no two boys sit together?
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(7!)2
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(8!)2
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7!8!
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15!
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Question 14 Explanation:
→ First fix one boy and place other 7 in alternative seats so total ways is 7! Because they are seated in circular table. (n-1)!.
→ Now place each girl between a pair of boys. So, total ways of seating arrangement of girls is 8!
→ Finally, 7!8! Possible ways are possible.
→ Now place each girl between a pair of boys. So, total ways of seating arrangement of girls is 8!
→ Finally, 7!8! Possible ways are possible.
Correct Answer: C
Question 14 Explanation:
→ First fix one boy and place other 7 in alternative seats so total ways is 7! Because they are seated in circular table. (n-1)!.
→ Now place each girl between a pair of boys. So, total ways of seating arrangement of girls is 8!
→ Finally, 7!8! Possible ways are possible.
→ Now place each girl between a pair of boys. So, total ways of seating arrangement of girls is 8!
→ Finally, 7!8! Possible ways are possible.
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