Two numbers are said to be co-prime when their GCD is 1. GCD( 26,13) = 13 GCD ( 26,34) = 2 GCD (13, 34) = 1 SO answer is 13 and 34.

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Given 3red, 4yellow, 5green shirts Total shirts = 3+4+5 = 12 Probability of getting Red = 3/12 = 1/4

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Let 3/7 + 4/9 + G =1 27+28/63 + G = 1 G = 1 – 55/63 G = 8/63

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Trail method. (Or) 218-125=93, 280-218=62, 280-125=155, 324-218=124, 342-125=217, 342-125=217 H.C.F of 93,155,217,62,124,217 is 31

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(5C3*3C1)/8C4 ==> 3/7

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