To get this party started, PENS GET BORING
I oscillate between 10 different pens
i like to use fineliners for maths
i use light ball pens for essay writing
6! x 5!
M W M W M W M W M W M
the men can be arranged in 6! ways
women can be arranged 5! ways
B)
C W M W M W M W M W D
C and D can be arranged 2! ways
remaining men can be arranged 4! ways
women can be arranged 5! ways
= 2! x 4! x 5! ways
probability = (2! x 4! x 5!) / (5!6!)