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In an examination 75% of the students passed in mathematics, 45% passed in general science and 30% passed in both subject. What per cent of the students have failed in both subject?

Created: 6 years ago | Updated: 2 years ago

যদি দুইটি সন্নিহিত কোণের সমষ্টি ১৮০° হয়, তাহলে কোণ দুইটিকে পরস্পরের  সম্পূরক কোণ বলে

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