A) \[{{G}_{1}}{{G}_{2}}a\]
B) \[2{{G}_{1}}{{G}_{2}}a\]
C) \[3{{G}_{1}}{{G}_{2}}a\]
D) None of these
Correct Answer: B
Solution :
Trick: Put \[b=1\] and \[c=8\] so that \[a=4.5\] and \[{{G}_{1}}=2,\ {{G}_{2}}=4\]. Now \[G_{1}^{3}+G_{2}^{3}=72\]. Also option (b) gives this value\[i.e.\]\[2\times 2\times 4\times \frac{9}{2}=72\].
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