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Ten tickets numbered $1, 2, 3, ..., 10.$ 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

 a. $(7^6 +1)/10^6$ b. $(7^6 - 6^6)/10^6$ c. $(7^6+6^6)/10^6$ d. $6^6/10^6$

b right?

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