A) 50
B) 25
C) 100
D) 80
Correct Answer: B
Solution :
We have, \[\text{np}=\text{2}0\]and \[\text{npq}=\text{4}\] \[\Rightarrow \] \[q=\frac{1}{5}\] \[\Rightarrow \] \[p=\frac{4}{5}\] \[\because \] \[np=20\] \[\therefore \] \[n=25\]
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