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In any case Wye speaks truth. Now at most 2 people speaks truth for 1 question. So case (1) : Wye and Axe speaks truth Probability = 3/5 × 7/20 × (1-5/6) = 7/200 Case (2) : Wye and Zed speaks truth Probability = 3/5 × 5/6 × (1-7/20) = 13/40 Case (3) : only Wye speaks truth Probability = 3/5 × (1-5/6) × (1-7/20) = 13/200 Add the three cases, we get = 7/200+ 13/40+ 13/200 = 7/40
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Working together, A and B can do a certain work in 45 days. They work together for 10 days. They complete the remaining work in 28 days with the assista...
A man does double the work done by a boy in the same time. The number of days that 3 men and 4 boys will take to finish a work which can be done by 10 m...
‘A’ and ‘B’ can complete a certain work in 20 days and 10 days, respectively. They started working together and worked till completion of the wo...
