How Many Fingers

Assume there are exactly 7 billion (7,000,000,000) people alive on the planet. What would be the sum if you multiplied together the number of fingers each person had on their left hand?

For this brain teaser, all thumbs count as fingers.

View Answer
The sum would be zero. All it would take is for one person to have no fingers on their left hand. Any number multiplied by zero equals zero.

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