Please help me with comprehension 2

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Please find below the solution to the asked query:

Total Probabilty of success=He studies 10 hours AND gets success OR He studies 7 hours AND gets success ORHe studies 4 hours AND gets success=0.1×80%+0.2×60%+0.7×40%=0.1×0.8+0.2×0.6+0.7×0.4=0.08+0.12+0.28=0.48OptionCFor fifth part:Required probabilty=He studies 4 hours AND gets successTotal Probabilty of success=0.7×40%0.48=0.7×0.40.48=0.280.48=712OptionBSixth partProbabilty of success=0.48Probabilty of not getting success=1-0.48=0.52Required probabilty=He studies 4 hours AND does not get successHe does not get success=0.7×100-40%0.52=0.7×0.60.52=0.420.52=2126OptionD

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