Question Solution Error?
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  I'm slightly confused by why 12 times 6 would be 120. Is this an error in the solution or am I missing something? 
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 @azhong392 Thanks for noticing this! This is a typo. The answer is correct, but the multiplication should say \(12 \times 6 = 72.\) It's been fixed now. Thanks very much for letting us know!   

