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permutation question (math) [urgent]
image here
please solve this problem for me. the correct answer is c.
i put 10!/(4!6!), then i know i am suppose to divide/subtract something, but i don't know what. (i have never done this kind of problem before.)
image here
please solve this problem for me. the correct answer is c.
i put 10!/(4!6!), then i know i am suppose to divide/subtract something, but i don't know what. (i have never done this kind of problem before.)