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a)
1=7- 2n/5|*5
5=35-2n
5-35=-2n
-30=-2n
n=15
a₁₅=1
b)
0<7- 2n/5|*5
0<35-2n
-35<-2n|/(-2)
17,5>n
n=17
ciąg ma 17 wyrazów dodatnich