A) \[1620+405\,\,yr\]
B) \[\frac{1620\times 405}{1620+405\,\,}yr\]
C) \[\sqrt{1620\times 405}\,yr\]
D) \[\frac{1620+405}{2\,\,}yr\]
Correct Answer: B
Solution :
\[{{T}_{M}}=\frac{{{T}_{M\alpha }}\times {{T}_{M\beta }}}{{{T}_{M\alpha }}+{{T}_{M}}_{\beta }}\]
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