4
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Ten tickets numbered $1, 2, 3, \ldots 10.$ Six tickets are selected at random one at a time with replacement. The probability of the largest number appearing on the selected ticket being $7$ is ________

- $(7^6 +1)/10^6$
- $(7^6 - 6^6)/10^6$
- $(7^6+6^6)/10^6$
- $6^6/10^6$

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