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?

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? 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

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৪ঃ ৫= ১২ঃ x হলে x -এর মান কত হবে?
চারটি সমানুপাতিক রাশির প্রান্তীয় রাশি দুটির গুনফল ২০০। প্রথম রাশিঃ দ্বিতীয় রাশি= ১ঃ২, দ্বিতীয় রাশিঃচতুর্থ রাশি= ১ঃ৪। তৃতীয় রাশিটি কত?
কঃখ= ১ঃ২ এবং খঃগ = ৩ঃ৪ হলে কঃখঃগ কতো?
দুটি ক্রমিক জোড় সংখ্যার অনুপাত ১ঃ২। সংখ্যা দুটি নির্ণয় করুন।