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?

A 15/16
B 7/8
C 1/4
D 1/8

Correct Answer: 15/16

প্রথমে stroke = 12 ; দ্বিতীয় = 14 ; তৃতীয় = 18, চতুর্থ = 116 প্রতিবার এর পূর্বের অংশ হিসেব করে = 816 + 416 + 216 + 116 = 1516
Bissoy MCQ
#গণিত #ভগ্নাংশ (Fraction) #United Commercial Bank Ltd (UCB) #United Commercial Bank Ltd - Management Trainee Officer - 07.06.2013

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৪ঃ ৫= ১২ঃ x হলে x -এর মান কত হবে?
A ১২
B ১৩
C ১৪
D ১৫
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A ৫
B ১০
C ২০
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কঃখ= ১ঃ২ এবং খঃগ = ৩ঃ৪ হলে কঃখঃগ কতো?
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B ২ এবং ৪
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