a)x={24,25,26,27,28.......49,50}
nr de elemente = 50-24+1=27
raspuns corect 5) 27
b) x=(0,5,10,15.....125}
0×5×10×15×...×125=0
raspuns corect 2) 0
c) 1≤2x+1<17
2x+1≥1 x≥0
2x+1<17 2x<16 x<8
x={0,1,2,3,4,5,6,7}
1+2+3+4+5+6+7=28
raspuns corect 3) 28
d)2x+1>18
2x>17
x>17/2
x>8,5
x={9,10,11,....∞}
cel mai mic element este 9
raspuns corect 1) 9
