A) \[\frac{16}{625}\]
B) \[\frac{8}{625}\]
C) \[\frac{10}{17}\]
D) None of these
Correct Answer: A
Solution :
Number of digits which can appear at unit place =10 \[\therefore \] \[n(S)=10\] In the multiplication of the four number to get 1, 3, 5 or 7 at the unit place, it is necessary that in every number unit's digit is 1, 3, 5 or 7. \[\therefore \] \[n(A)=4\] \[\therefore \] \[P(A)=\frac{4}{10}=\frac{2}{5}\] \[\therefore \] Required probability\[={{\left( \frac{2}{5} \right)}^{4}}=\frac{16}{625}\]You need to login to perform this action.
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