# This is tough may be not for u

Number are selected at random, one at a time,from the two-digit number $$00,01,02,03,...99$$ with replacement.An event $$E$$ occurs if and only if the product of the two digits of selected number is $$18$$.If four numbers are selected, the probability that the event $$E$$ occurs at least $$3$$ times,is $$\frac{k}{(25)^{4}}$$,find the value of $$k$$

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