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IA^B refers to A raised to the power B.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 is 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
asked in Quantitative Aptitude by (14 points)  
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b right?

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