If a set X contains n elements and you remove one element, how many elements remain?

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Multiple Choice

If a set X contains n elements and you remove one element, how many elements remain?

Explanation:
Removing an element from a finite set decreases the size by exactly one. If X has n elements and you take away one element that was in the set, you’re left with n minus one elements. This matches the idea of starting with n items and removing one, so there are one fewer item. The other options would mean no change, removing two, or adding an element, which isn’t the case when you remove exactly one element. For example, if n is 7, removing one leaves 6.

Removing an element from a finite set decreases the size by exactly one. If X has n elements and you take away one element that was in the set, you’re left with n minus one elements. This matches the idea of starting with n items and removing one, so there are one fewer item. The other options would mean no change, removing two, or adding an element, which isn’t the case when you remove exactly one element. For example, if n is 7, removing one leaves 6.

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