Question

URGENT !!!! aratati ca 2 la puterea n* 2* 5 la puterea n plus 1 Divide pe 3 oricane ar fi n
12 puncte !!!

Answer 1

$2^{n}*2*5^{n+1}=$

$=2^{n+1}*5^{n+1}=$

$=(2*5)^{n+1}*=$

$=10^{n+1}$ nu il divide pe 3.