Quanto é 12!3!/15! ; 15!13!/14!12! e 10!/3!7!
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=2,280,960.0027275; =4.47412939E+19; =3,048,192,000
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12!3!/15! => 12!3!/15*14*13*12!
3!/15*14*13
3*2*1/15*14*13
1*1*1/5*7*13
1/455
15!13!/14!12! => 15*14!13*12!/14!12!
15*13=195
10!/3!7! => 10*9*8*7!/3!7!
10*9*8/3*2*1
5*3*8=120
3!/15*14*13
3*2*1/15*14*13
1*1*1/5*7*13
1/455
15!13!/14!12! => 15*14!13*12!/14!12!
15*13=195
10!/3!7! => 10*9*8*7!/3!7!
10*9*8/3*2*1
5*3*8=120
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