a)n
n+1
n+2
n+n+1+n+2=54
3n=51 =>n=17
Numerele sunt 17, 18 si 19.
b)n
n+1
n+2
n+3
n+n+1+n+2+n+3=90
3n=84 =>n=28
Numerele sunt 28, 29, 30 si 31.
c)2n
2n+2
2n+4
2n+2n+2+2n+4=252
6n=246 =>n=41
Numerele sunt 82, 84 si 86.
d)n
n+1
n+2
n+3
n+4
n+n+1+n+2+n+3+n+4=75
5n=65 =>n=13
Numerele sunt 13, 14, 15, 16 si 17.
e)2n+1
2n+3
2n+5
2n+7
2n+1+2n+3+2n+5+2n+7=72
8n=56 =>n=7
Numerele sunt 15, 17, 19 si 21.
