A) 50
B) 8
C) \[1/5\]
D) 1
Correct Answer: B
Solution :
Sol. [b] We have, \[12=2\times 2\times 3={{2}^{2}}\times 3,\] |
\[42=2\times 3\times 7\] |
\[\therefore \,\,\,\,\,\,\,\,LCM(12,42)={{2}^{2}}\times 3\times 7=84\] |
\[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,10m+4=84\] |
\[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,10m=84-4=80\,\,\,\,\,\,\Rightarrow \,m=\frac{80}{10}=8\] |
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