Bihar Police Constable practice question
The number of virus-infected cells in a lab sample doubles every hour. If the starting count is 9, what will the count be after 6 hours (i.e., after 6 successive doublings)?
From a Bihar Police Constable Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (D) 576
Each period the count is multiplied by 2, so after 6 periods the count is the initial value raised through the power of 2: 9 × 26 = 9 × 64 = 576.
हिंदी में प्रश्न
एक प्रयोगशाला नमूने में वायरस-संक्रमित कोशिकाओं की संख्या हर घंटे दोगुनी हो जाती है। यदि प्रारंभिक संख्या 9 है, तो 6 घंटों (यानी 6 बार दोगुना होने) के बाद संख्या कितनी होगी?
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सही उत्तर: (D) 576
प्रत्येक अवधि में संख्या 2 से गुणा होती है, इसलिए 6 अवधियों के बाद संख्या = प्रारंभिक मान × 2 की घात: 9 × 26 = 9 × 64 = 576 होगी।
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