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What are possible combinations?

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## Related Questions

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### What are the combinations for 2 6 8?

There are 8 possible combinations:
{},
{2},{6},{8},
{2,6},{2,8},{6,8} and
{2,6,8}
There are 8 possible combinations:
{},
{2},{6},{8},
{2,6},{2,8},{6,8} and
{2,6,8}
There are 8 possible combinations:
{},
{2},{6},{8},
{2,6},{2,8},{6,8} and
{2,6,8}
There are 8 possible combinations:
{},
{2},{6},{8},
{2,6},{2,8},{6,8} and
{2,6,8}