Question

afla toate nr naturale pare de forma a2b

Answer 1

din a2b=par⇒a∈{1,2,3,4,5,6,7,8,9} b∈{2,4,6,8}⇒a2b∈{122,124,126,128,222,224,226,228,322,324,325.....(si tot inlocuiesti)}