A) 3.08
B) 3.108
C) 3.1008
D) 3.1 108
Correct Answer: D
Solution :
\[\sqrt{7.84}+\sqrt{0.0784}+\sqrt{0.000784}+\sqrt{0.00000784}\] \[=\sqrt{\frac{784}{100}}+\sqrt{\frac{784}{10000}}+\sqrt{\frac{784}{1000000}}+\sqrt{\frac{784}{100000000}}\] \[=\frac{28}{10}+\frac{28}{100}+\frac{28}{1000}+\frac{28}{10000}\] \[=0.8+0.28+0.028+0.0028=3.1108\]
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