A) \[\frac{{{M}_{1}}+{{M}_{2}}}{2}\]
B) \[\frac{a{{M}_{1}}+\left( \frac{{{M}_{2}}}{a} \right)}{2}\]
C) \[\frac{1}{2a}[({{a}^{2}}-1){{M}_{1}}+2{{M}_{2}}]\]
D) \[\frac{1}{2a}[2({{a}^{2}}-1){{M}_{1}}+{{M}_{2}}]\]
Correct Answer: C
Solution :
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