Question 137
If $$\sqrt7=2.646$$, then the value of $$\frac{1}{\sqrt28}$$ up to the three places of decimal is:
Solution
Given : $$\sqrt7=2.646$$
To find : $$\frac{1}{\sqrt28}$$
= $$\frac{1}{\sqrt{7\times4}}$$
= $$\frac{1}{2\sqrt7}=\frac{1}{2\times2.646}$$
= $$\frac{1}{5.292}=0.18896\approx0.189$$
=> Ans - (A)
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