-1 অথবা 2
1 এবং 2
1 অথবা -2
1 এবং -2
Source: স্থানীয় সরকার বিভাগের অধীন - জনস্বাস্থ্য প্রকৌশল অধিদপ্তরের - এস্টিমেটর - ০২.০২.২০১৮
Answer: 1 অথবা -2
Explanation:
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ইনপুট ও আউটপুট ডিভাইস
সাহিত্যিকদের আত্মজীবনী
বাংলাদেশ ও বিশ্বের নদী, সাগর ও মহাসাগর
নৌকা ও স্রোত (Boat and Stream)
পাটিগণিত প্রাথমিক ধারণা (Basics of Arithmetic)
মানুষিক দক্ষতা
ভগ্নাংশ (Fraction)
জ্যামিতি (Geometry)
মহাদেশ ও দেশ পরিচিতি
বিন্যাস, সমবেশ ও সম্ভাব্যতা (Permutation, Combination and Probability)
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