A) \[16\]
B) \[17\]
C) \[20\]
D) \[15\]
Correct Answer: B
Solution :
Let \[x={{7}^{-20}}\] \[{{\log }_{10}}x=-20\,{{\log }_{10}}7\] \[=-20(0.8451)\] \[=-16.902\] Hence, the first significant figure is 17.You need to login to perform this action.
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