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Question
The average of three Numbers is U. If two numbers are x and y, which is the third number?
xy -u
x/u - y
3x - u - y
3 u - x - y
None of them
ANSWER : 4
Descrption
<pre>ধরি, third number হচ্ছে z <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mrow><mi>x</mi><mo> + </mo><mi>y</mi><mo> + </mo><mi>z</mi></mrow><mn>3</mn></mfrac><mo> = </mo><mi>v</mi><mspace linebreak = "newline"/><mo>⇒</mo><mi>x</mi><mo> + </mo><mi>y</mi><mo> + </mo><mi>z</mi><mo> = </mo><mn>3</mn><mi>v</mi><mspace linebreak = "newline"/><mo>⇒</mo><mi>z</mi><mo> = </mo><mn>3</mn><mi>v</mi><mo> - </mo><mi>x</mi><mo> - </mo><mi>y</mi></math> </pre>
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