1) 2
2) 30
3) +-1, +-5, +-7,+-35
M4={4, 8, 12, 16, 20, 24, 28, 32, ...}
x<19, IxI∈M4, deci
A={-16, -12, -8, -4, 4, 8, 12, 16}
B={+-5, +-10, +-15, +-15, +-20, +-25, +-30}
C={+-21, +-28, +-35, +-42}
4) 120, 250
6) 350, 352, 354, 356, 358 deci 5 numere
50 numere
3 numere
6 numere