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2014-07-25T11:23:28+03:00
2014-07-25T11:29:33+03:00
Ab +2ac-ad= ab+ac+ac-ad=a(b+c)+a(c-d)= 5/6 * 7/20 + 5/6 *1/24=7/24 + 5/144=

=(42+5)/144= 47/144