self Maths Puzzle

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.

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self Other Question

A sum of rs 10 is lent to be returned in 11 monthly installment of re 11. rate of interest ? {(6374^1793)*(625^317)*(341^491)}??