Question 268892
10/34 * 17/19 * 19/20 =
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10/(2*17) * (17/19) * 19/(2*10) 
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Cancel the 10's
Cancel the 17's
Cancel the 19's
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= 1/2 * 1/1 * 1/2
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= 1/4
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Cheers,
Stan H.