IBPS RRB Officer Scale-I Prelims practice question
Simplify: ∛0.000729 + ∛0.729 + ∛729
From a IBPS RRB Officer Scale-I Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (A) 9.99
Each term is a perfect cube of a decimal: ∛0.000729 = 0.09, ∛0.729 = 0.9, ∛729 = 9 (the number of decimal places becomes one-third under the root). Sum = 0.09 + 0.9 + 9 = 9.99. Taking ∛0.000729 as 0.9 shifts the decimal point wrongly.
हिंदी में प्रश्न
सरल कीजिए: ∛0.000729 + ∛0.729 + ∛729
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सही उत्तर: (A) 9.99
प्रत्येक पद किसी दशमलव का पूर्ण घन है: ∛0.000729 = 0.09, ∛0.729 = 0.9, ∛729 = 9 (मूल के नीचे दशमलव स्थान एक-तिहाई हो जाते हैं)। योग = 0.09 + 0.9 + 9 = 9.99। ∛0.000729 को 0.9 लेना दशमलव बिंदु की गलती है।
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