self Maths Puzzle

{(6374^1793)*(625^317)*(341^491)}??

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self Other Question
A mathematician choose some day in 30 days of months by a forumula..

3,4,10, 3,16,25, 6, ?

Find the next day in that month. what least no should be subtracted from 1690 so that it is divisible by 69.