Find the number of pairs of coprime integers (n,m) such that 1≤n≤m≤20.

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1. Find the number of pairs of coprime integers (n,m) such that 1≤n≤m≤20.
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2. Find the number of pairs of coprime integers (n,m) such that 1≤n≤m≤20.
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3. I don't even know where to start with this. -_-As A and B range over all ordered pairs of distinct coprime positive integers,
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4. I don't even know where to start with this. -_-As A and B range over all ordered pairs of distinct coprime positive integers,
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