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madisonreynolds2208
25.02.2021 •
Mathematics
Im hungry pls feed me
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Ответ:
No hahahahahahahaha
Step-by-step explanation:have a good day
Ответ:
LOL!!
Step-by-step explanation:
Man I feel the same way.
AND I'M A GIRL XD
Ответ:
31,827 ways
Step-by-step explanation:
Total number of books, n = 18
Number of books to be selected, r = 7
Since, the order of arrangement doesn't matter ;
We use the combination formula :
nCr = n! ÷ (n-r)! r!
18C7 = 18! ÷ 11!7!
18C7 = (18*17*16*15*14*13*12) ÷ (7*6*5*4*3*2*1)
18C7 = 160392960 / 5040
18C7 = 31,827 ways