A) \[\frac{4}{625}\]
B) \[\frac{18}{625}\]
C) \[\frac{16}{625}\]
D) None of these
Correct Answer: C
Solution :
Total number of digits in any number at the unit place is 10. \[\therefore \] n(S) = 10 To get the last digit in product is 1, 3, 5, or 7, it is necessary the last digit in each number must be 1, 3, 5 or 7. n = 4, \[\therefore \]P = \[\frac{4}{10}=\frac{2}{5}\] \ Required probability \[={{\left( \frac{2}{5} \right)}^{4}}=\frac{16}{625}\].
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