Can you conjecture a new formula for V −E+ F for graphs with exactly two pieces? Try various examples first and show at least 3 example graphs. b) Can you conjecture a new formula for V − E+ F for graphs with exactly three pieces? Try various examples first and show at least 3 example graphs. c) Can you conjecture a new formula for V − E + F for graphs with exactly n pieces? Search for a pattern

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Q: Show that the solution (if exists) is unique:

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A:

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Q: H.

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A:

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