A) \[\frac{1}{2}{{(}^{10}}{{C}_{5}})\]
B) \[2{{(}^{8}}{{C}_{4}})\]
C) \[\frac{1}{2}{{(}^{8}}{{C}_{5}})\]
D) None of these
Correct Answer: B
Solution :
First omit two particular persons, remaining 8 persons may be 4 in each boat. This can be done in \[^{8}{{C}_{4}}\] ways. The two particular persons may be placed in two ways one in each boat. Therefore total number of ways are\[=2{{\times }^{8}}{{C}_{4}}\].
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