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No one can, for three reasons.

Reason 1: There are several long-standing unsolved problems in mathematics. Since they are unsolved, nobody knows how hard they are.

Reason 2: What one person may find hard can seem trivially easy to another. But that other person may find something hard that the first would find simple.

Reason 3: There may be new problems waiting to be discovered.

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11y ago

What else can I help you with?