Question

cate submultimi cu 3 elemente ale multimii {2, 3, 4, ..., 19, 20} au elemente in progresie geometrica?

Answer 1

Multimea data este :

{2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20}

Submultimile acesteia ,de 3 elemente  in progresie geometrica sunt >>

{2,4,8}

{2,6,18}

{3,6,12}

{4,8,16}

{5,10,20}


>>>5 submultimi