જો 3a = 27b = 81c અને abc = 144, તો \(12\left( {\frac{1}{a} + \frac{1}{{2b}} + \frac{1}{{5c}}} \right)\) ની કિંમત કેટલી છે:

1
17/120
2
18/10
3
33/10
4
18/120

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