A) 4
B) 6
C) 8
D) None of these
Correct Answer: A
Solution :
[a] As shown in figure 1, 2 and X are the three boys and 3, 4 and y are three girls, Boy X will have neighbours as boys 1 and 2 and the girl Y will have neighbours as girls 3 and 4. 1 and 2 can be arranged in P (2, 2) ways \[=2!=2\times 1=2\] ways Also, 3 and 4 can be arranged in P (2, 2) ways \[=2!=2\times 1=2\] ways Hence, required no. of permutations \[=2\times 2=4\]You need to login to perform this action.
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