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Question
If 1/2 of the air in a tank is removed with each stroke of a vacuum pump,what fraction of the original amount of air has been removed after 4 strokes?
15/16
7/8
1/4
1/8
1/16
ANSWER : 1
Descrption
<pre>প্রথমে stroke = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>2</mn></mfrac></math> ; দ্বিতীয় = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>4</mn></mfrac></math> ; তৃতীয় = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>8</mn></mfrac></math>, চতুর্থ = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>16</mn></mfrac></math> প্রতিবার এর পূর্বের অংশ হিসেব করে = <math xmlns = "http://www.w3.org/1998/Math/MathML"><mfrac><mn>8</mn><mn>16</mn></mfrac><mo> + </mo><mfrac><mn>4</mn><mn>16</mn></mfrac><mo> + </mo><mfrac><mn>2</mn><mn>16</mn></mfrac><mo> + </mo><mfrac><mn>1</mn><mn>16</mn></mfrac><mo> = </mo><mfrac><mn>15</mn><mn>16</mn></mfrac></math> </pre>
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