Question

4. Reprezintă fiecare mulțime folosind proprietatea caracteristică a elementelor sale:
B = {2,4,8,16,32,64},
D = {0, 1,4,9,...,49}.
A={3,4,5,...,14},
C={1,6,11,16,21},

Answer 1

B = { x € ( apartine) N | x = 2 la n, 0 < n < 7 }

D = { x € N | x + 3, x + 5, x + 7, x + 9, x + 11, x + 13 € D, 0=< x < 2 }

A = { x € N | 2 < x < 15 }

C = { x € N | x + 5 € C, 0 < x < 17 }