Mathematics
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OpenStudy (anonymous):
Determine the largest multiple of 6 which divides 14! Explain your work.
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jimthompson5910 (jim_thompson5910):
14! = 14*13*12*11*10*9*8*7*6*5*4*3*2*1
Rewrite the right side in the form of 6k where k is some number
jimthompson5910 (jim_thompson5910):
make sure k is as large as possible
OpenStudy (anonymous):
im having trouble understanding. are you saying 12 is the answer?
jimthompson5910 (jim_thompson5910):
no, 12 isn't the answer
jimthompson5910 (jim_thompson5910):
can you rearrange 14*13*12*11*10*9*8*7*6*5*4*3*2*1 into the form of 6k
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OpenStudy (anonymous):
how?
jimthompson5910 (jim_thompson5910):
is there a 6 anywhere in that list?
OpenStudy (anonymous):
yea
jimthompson5910 (jim_thompson5910):
ok pull that out and rewrite into the form 6k where k is some number
OpenStudy (anonymous):
ok i pull out 6k, then what?
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OpenStudy (anonymous):
im not getting this
jimthompson5910 (jim_thompson5910):
14! = 14*13*12*11*10*9*8*7*6*5*4*3*2*1
14! = 6*14*13*12*11*10*9*8*7*5*4*3*2*1
14! = 6*(14*13*12*11*10*9*8*7*5*4*3*2*1)
OpenStudy (anonymous):
and then i just calculate it?
jimthompson5910 (jim_thompson5910):
yeah calculate everything after the 6*
OpenStudy (anonymous):
is the answer within the parenthesis or is it the answer after i multiply that all by six
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jimthompson5910 (jim_thompson5910):
the result after you multiply all that out in the parenthesis
jimthompson5910 (jim_thompson5910):
because that will give you the multiple of 6
jimthompson5910 (jim_thompson5910):
that's a factor of 14!
OpenStudy (anonymous):
yea but is the answer what's in the parenthesis? or that times 6
jimthompson5910 (jim_thompson5910):
whatever is in the parenthesis, multiply that out
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OpenStudy (anonymous):
and that's the answer whatever k is
jimthompson5910 (jim_thompson5910):
yes
OpenStudy (anonymous):
thanks
jimthompson5910 (jim_thompson5910):
np