Yes, but red and green light make yellow light.
If you go to the color-selection dialog of any paint program, it will give you a place to try specific red-green-blue combinations to see how they look.
DrScheme has a color dialog, too. Select Preferences from DrScheme's Edit menu (or the DrScheme menu under Mac OS X), then go to the Check Syntax panel and click one of the Change Color buttons.
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