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what is the remainder when 6^17+117^6 is divided by 7?

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TCS Other Question

15 Java programmers, working in a constant pace, finish a web page in 3 days. If after one day, 9 programmers how many more days are needed to finish the remaining job ?
(a) 2 (b) 4 (c) 5 (d) 6
if there are six periods in each working day of school. in hw many ways can one set up time table such that each subject is allowed atleast one period?