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Question
যদি x>7 এবং y>-3 হয়, তবে কোনটি সঠিক?
xy>7
xy>-21
xy<3
-x>2y
ANSWER : 1
Descrption
<p>x - এর মান হতে পারে : 8 9 10 11 12 13 14….<br /> Y - এর মান হতে পারে : - 2 - 1 0 1 2 3 4…..<br /> (ক) X = 14,y = - 2 xy = - 28<br /> <math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x2234;</mo></math>xy >7 সত্য নয়।<br /> (খ) একই ভাবে xy > - 21 সত্য নয়।<br /> (গ) যখন x = 14,y = 1 তখন xy = 14<br /> <math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x2234;</mo></math>x<3 সত্য নয়। <br /> (ঘ) যখন x = 8, y = 1 তখন - x = - 8,2y = 2<br /> <math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>&#x2234;</mo></math> - x>2y সত্য নয়। </p>
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