Question

AFLATI TOATE NR DE FORMA 23AB CARE SE IMPART EXACT LA 42

Answer 1

23ab:42=x rest 0
cel mai mic: 2300:42=54 rest 32 => x>54
cel mai mare2399:42=57 rest 5 => x≤57
=> 54<x≤57

Deci 23ab∈ {55*42, 56*42, 57*42}
23ab ∈ {2310, 2352, 2394}