Thad: I think the relevant quantities in context would be ten or more doubles and five or more boxcars. As far as your calcs go, I think the 10 doubles figure has to be multiplied by the combinations of 10 items chosen from 45, which I think is 45!/(10!*35!). A comparable adjustment needs to be made to the second calc, but I don't have time to work it out :-)
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