A) 21
B) 12
C) 18
D) 15
Correct Answer: C
Solution :
\[m=\frac{{{f}_{o}}}{{{f}_{e}}}\left( 1+\frac{{{f}_{e}}}{D} \right)\Rightarrow m=\frac{90}{6}\left( 1+\frac{6}{30} \right)\Rightarrow m=18\]You need to login to perform this action.
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