Maths Maths Puzzle Numerical Ability Averages

What is the formula for following function and how to solve this type of question

1+n/1! + n^2/2! + n^3/3! + n^4/4!..................

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Maths Other Question

in a normal 5day work,each of 12 employee produces Rohan has three more fife rupee notes than ten rupee notes. if he has Rs.195 in total , how many notes of each kind he has??