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In a test, +2 marks are given for each correct answer and ( - 1 ) for each wrong answer. A student has scored 21. If he has attempted total of 12 correct questions. How many questions has he attempted incorrectly ? [4 MARKS]

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In a test, +2 marks are given for each correct answer and ( - 1 ) for each wrong answer. A student has scored 21. If he has attempted total of 12 correct questions. How many questions has he attempted incorrectly ?
[4 MARKS]



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