Subject
Bank Exam
Topic
Dutch-Bangla Bank Ltd. - PO (IBA, DU) (15.11.2019) - 2019
If x is decreased from 2 to - 2. which of the following must increase ?
If x is decreased from 2 to - 2. which of the following must increase ?
ক)
2 + xখ)
5 + x2গ)
1 + 1/xঘ)
1 /(x-3)ঙ)
None of theseExplanation
x এর মান 2 থেকে কমিয়ে -2 করলে নিচের কোনটির মান বৃদ্ধি পাবে ? x এর মান 2 থেকে কমিয়ে -2 করায় প্রথমে x = 2 এবং পরে x = -2 বসিয়ে আমরা অপশনগুলো পরীক্ষা করিঃ => অপশন a) এর x=2 হলে 2+x = 2 +2 =4 x = -2 হলে 2-2 = 0 অপশন a) না বেড়ে কমেছে, তাই এই অপশনটি বাদ । => অপশন b) এর x = 2 হলে 5 - x2 = 5 - (2)2 = 5 - 4 =1 x = -2 হলে 5 - ( -2 )2 = 5 - 4 = 1 অপশন b) অপরিবর্তিত রয়েছে, তাই এই অপশনটিও বাদ । => অপশন c) x = 2 হলে 1+1/2 = 1.5 x = -2 হলে 1 + (1/-2)= 1 - 1/2 = 1/2 = 0.5 অপশন c) না বেড়ে কমেছে, তাই এই অপশনটিও বাদ । => অপশন d) এর x = 2 হলে 1/x-3 = 1/2-3 = 1/(-1)= -1 x = -2 হলে 1 / x-3 = 1/(-2-3) =1/(-5) =-0.2 স্পষ্ঠতই -1 অপেক্ষা -0.2 বড় । তাই এটিই সঠিক উত্তর ।Related questions
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