Question

determina numerele de forma ab stiind ca: a=b+3;b=a+3;40<ab<60sia>b

Answer 1

a = b + 3 => ab ∈ { 30; 41; 52; 63; 74; 85; 96 }
b = a + 3 => ab ∈ { 14; 25; 36; 47; 58; 69 }
40<ab<60 si a>b => ab ∈ { 41; 42; 43; 50; 51; 52; 53; 54 }