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Mathematics 16 Online
OpenStudy (anonymous):

How many 4 digit numbers can be formed using only the numbers 3 2 7 6 0 4 9 if: a) there are no repeats allowed? b) the number is odd and no repeats allowed? c) the number is greater than 4000 and no repeats are allowed? d) the number is greater than 4000 and repeats are allowed? My answer to follow...last one, for now I think :D

OpenStudy (anonymous):

a) 840 b) 360 c)480 d) 1371

OpenStudy (anonymous):

arg..wait...this doesn't make sense. should it be 7c4 ?? and same for the rest

OpenStudy (anonymous):

first one is 7 choose 4 so it can't be that large

OpenStudy (anonymous):

do the rest use that method too ?

OpenStudy (anonymous):

second is 3 choose 1 times 6 choose 3

OpenStudy (anonymous):

the rest require too much thinking for me but the method is the same last one is different actually because repeats are allowed

OpenStudy (anonymous):

actually greater than 4000 just means starts with 4, 6, 7, or 9

OpenStudy (anonymous):

I got that part but I'm pretty sure I've screwed up this entire assignment not using nCr....sigh back to the drawing board I guess. thank you!

OpenStudy (anonymous):

on line class or do you have to hand this in?

OpenStudy (anonymous):

btw don't use nCr for the last one, because you can repeat

OpenStudy (anonymous):

online class.thought i'd be smart and get ahead in summer school...such a bad idea lol

OpenStudy (anonymous):

it will be over soon enough, and then you will be done besides, you can always get help here

OpenStudy (anonymous):

first website I found that is actually useful..most you have to pay for or just don't help at all, this one is awesome

OpenStudy (anonymous):

i think so too

OpenStudy (anonymous):

thought this would be my last question..that was untrue..

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