A) 31
B) 41
C) 51
D) None of these
Correct Answer: B
Solution :
\[\frac{56\ !}{(50-r)\ !}\times \frac{(51-r)\ !}{54\ !}\] \[=\frac{30800}{1}\Rightarrow 56\times 55\times (51-r)=30800\] \[\Rightarrow \]\[r=41\].
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