A test contain 15 true/false questions. A correct answer awarded 3 mark,a wrong answer -1,and a question not attended is awarded 0.A student attempt s 13 questions and gets 27 marks. how many questions did he attempts correctly
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if 1correct ans=3marks
then9correct ans=9*3=27
if all 13 correct then 13*3=39
so,diff is12means12/3=4
so an is9
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