Question
The greatest four digit perfect square number is = ?
Answer: Option B
$$\eqalign{
& \,\,\,\,\,\,\,9|\overline {99} \,\,\overline {99} \,\,(99 \cr
& \,\,\,\,\,\,\,\,\,\,|\,81 \cr
& \,\,\,\,\,\,\,\,\,\,| - - - - - - \cr
& \,189|\,18\,99 \cr
& \,\,\,\,\,\,\,\,\,\,|\,17\,01 \cr
& \,\,\,\,\,\,\,\,\,\,| - - - - - - \cr
& \,\,\,\,\,\,\,\,\,\,|\,\,\,\,1\,98 \cr
& \therefore {\text{Required number}} \cr
& = \left( {9999 - 198} \right) \cr
& = 9801 \cr} $$
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$$\eqalign{
& \,\,\,\,\,\,\,9|\overline {99} \,\,\overline {99} \,\,(99 \cr
& \,\,\,\,\,\,\,\,\,\,|\,81 \cr
& \,\,\,\,\,\,\,\,\,\,| - - - - - - \cr
& \,189|\,18\,99 \cr
& \,\,\,\,\,\,\,\,\,\,|\,17\,01 \cr
& \,\,\,\,\,\,\,\,\,\,| - - - - - - \cr
& \,\,\,\,\,\,\,\,\,\,|\,\,\,\,1\,98 \cr
& \therefore {\text{Required number}} \cr
& = \left( {9999 - 198} \right) \cr
& = 9801 \cr} $$
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More Questions on This Topic :
Question 3. $$99 \times 21 - \root 3 \of ? = 1968$$....
Question 9. $$\root 3 \of {\sqrt {0.000064} } = ?$$....
Question 10. The value of **Hidden Equation** is ?
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