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What are the equivalent resistances when 1 ohm and 10^6 ohm are connected in parallel?

Question
What are the equivalent resistances when 1 ohm and 10^6 ohm are connected in parallel?
Approximately 1 ohm
Approximately 500000 ohm
Exactly 10^6 ohm
0 ohm
Answer
Approximately 1 ohm
Detailed Explanation
When one resistance is much smaller than the other, the parallel combination is approximately equal to the smaller resistance (~0.999999 ohm » 1 ohm).
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