If x>0, which of the following must be true ? 1.x-x2<0 2.2x-1>03.x3-x3>0

If x>0, which of the following must be true ? 1.x-x2<0 2.2x-1>03.x3-x3>0 Correct Answer Only I

দেয়া আছে, x > 0 তাহলে x এর মান যে কোনো ধনাত্মক সংখ্যা (পূর্ণ বা ভগ্নাংশ) হতে পারে। (i) x = 12 ধরলে x - x2 = 12 - 14 = 14>0   ∴ সত্য নয় (ii) x = 12 নিলে 2x - 1 = 2×12 - 1 = 0 হয় ∴ সত্য নয় (iii) x = 2 নিলে, x2 - x3 = 22 - 23 = - 4 হয় ∴x2 - x3>0 এটিও সত্য নয়।
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