Actually... LOL i realize why i never saw it. it's because i was using these tests at work and i minimized the browser window to the smallest it could possibly go while still seeing the questions... and when you do this, the "show answer" / "explain answer" buttons disappear because the window is too small...
Too funny. Glad it all worked out and .... don't get caught
Founder of GMAT Club
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Co-author of the GMAT Club tests
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