There were 50 questions in an exam. For each correct answer, 4 marks were awarded. For each wrong answer, 2 marks were reduced and for each non-attempted answer,
1 mark was deducted. If a student scores 120 marks by giving 35 correct answers, then find the probability that
(a) he answers a question incorrectly (3 marks)
(b) he leaves a question unanswered (2 marks)
(c) he answers a question correctly
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What is decomposition? Decomposition is the first stage in the recycling of nutrients that have been used by an organism (plant or animal) to build its body. It is the process whereby the dead tissues break down and are converted into simpler organic forms
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