A) 5th
B) 51st
C) 7th
D) 6th
Correct Answer: C
Solution :
\[{{3}^{50}}{{\left( 1+\frac{2x}{3} \right)}^{50}}\] \[\therefore \,\,\,\frac{{{T}_{r+1}}}{{{T}_{r}}}\ge 1\,\,\,\Rightarrow 102-2r\ge 15r\Rightarrow r\le 6\]
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