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In an examination there are 30 questi...

In an examination there are 30 questions. 1 mark is given for each correct answer and 0.25 is deducted for every incorrect answer. Ankur attempted all the questions and scored 13.75. How many incorrect answers did he have? (a) 10      (b) 11    (c) 12     (d) 15    (e) None of these

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