What is the least number which should be subtracted 0.000326 in order to make it a perfect square = ?

A. 0.000002

B. 0.000004

C. 0.02

D. 0.04

Answer: Option A

Solution(By Examveda Team)

$$\eqalign{ & 0.000326 = \frac{{326}}{{{{10}^6}}} \cr & \,\,\,\,1|\overline 3 \,\,\overline {26} \,\,(18 \cr & \,\,\,\,\,\,\,|\,\,1 \cr & \,\,\,\,\,\,\,| - - - - - - \cr & 28|\,\,\,2\,26 \cr & \,\,\,\,\,\,\,|\,\,\,2\,24 \cr & \,\,\,\,\,\,\,| - - - - - - \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2 \cr} $$
∴ Required number to be subtracted
$$\eqalign{ & = \frac{2}{{{{10}^6}}} \cr & = 0.000002 \cr} $$