Question

afla cifra x daca a) x7 > 49 b) x7 < 51 c) 2x1 < 262

Answer 1

x7 > 49 => x ∈ {5, 6, 7 ,8, 9}
x7 < 51 =>x ∈ {1, 2, 3 , 4}
2x1 < 262 =>x ∈ {0, 1, 2, 3 , 4, 5}