While finding the square root of 121 by repeated subtraction, in which step does 85 occur?
A
3rd
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B
5th
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C
8th
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D
6th
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Solution
The correct option is D 6th The sum of first n odd natural numbers is n2. This fact is used to find the square root of a number by repeated subtraction. In finding the square root of 121 by repeated subtraction the steps involved are:- StepNumberValue1121−1=1202120−3=1173117−5=1124112−7=1055105−9=96696−11=85785−13=72872−15=57957−17=401040−19=211121−21=0 You can clearly see that 85 occurs in the 6th step.