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'At least' means equal to or greater than. This meaning is not restricted to maths; it is one of the common everyday meanings of the phrase.

So if you have a question which, for example, tells you to calculate the probability of getting at least one head when a coin is flipped twice then it means:

What is the probability of getting one or more heads when a coin is flipped twice.

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13y ago

What else can I help you with?