Which set of numbers have an lcm of 78?

Answer 1

There are lots, for example:

{1, 78}

{1, 2, 78}

{1, 2, 3, 78}

{1, 2, 3, 6, 13}

{1, 2, 3, 6, 78}

{1, 2, 3, 6, 13, 39}

{1, 2, 3, 6, 13, 39, 78}

{2, 3, 13}

{2, 3, 39}