In how many ways can 10 Frenchmen, 10 Spanish be seated along a circle so that they are alternate?  Choose one
A) 8!*7!	B) 10!*9!	C) 5!*9!	D) 10!*5!	E) 11!9!
Required number is = 10!*9!   Answer is 10!*9!
<result>B</result>
In how many ways can 10 Frenchmen, 10 Spanish be seated along a circle so that they are alternate?