brendahndz8676
24.09.2019 •
Mathematics
Stind ca n! = 1*2*3* sa se arate ca nr 13! -11! se divide cu 31
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Ответ:
13! = 13×12×11!
13!-11!= (13×12×11! ) - 11!
= 11! (13×12 -1)
=11! (156 - 1)
= 11! ( 155)
= 11!(31×5)
13!-11! = 31( 11!×5)
so : 13!-11! se divide cu 31
Ответ:
a. 56
b. 72
c. 64
Step-by-step explanation: