At-most-2-element subsets of a 4-element set?

[shy flax]

Hi there im stuck at this question, any help would be appraicated, thank you very much

[frail shell]

That's all the ways of picking 2 or fewer numbers between 1 and 4, with no doublons (and not picking any is a choice)

So once you understand it it becomes a simple counting problem, unless you want to use some simple combinatorial formulas for it

[mortal goblet]

How many at-most-2-element subsets of a 4-element set?

At-most-2-element subsets of a 4-element set?

[bronze root]

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[grizzled shard]

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