CAT Full QA item 41: What is the units digit of 21³?
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The units digit follows from 1³.
Practice CAT Quantitative Ability MCQ questions with answers and explanations.
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The units digit follows from 1³.
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10²+15²=325.
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Area=11×18=198.
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By Vieta, root sum is the coefficient 33.
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(13+5)/2=9.0.
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Increase/base ×100 = 25%.
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By Vieta, root sum is the coefficient 11.
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(6+9)/2=7.5.
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Increase/base ×100 = 25%.
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9²+18²=405.
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Area=10×21=210.
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By Vieta, root sum is the coefficient 16.