Please check where am i mistaking?
why r u writing a^{n} in formula? , it is a_{n, }
in part (e), at last step , u forgot to write n! in denominator.
in part (f), for 1/(1+x), a_{n} will be (-1)^{n}
The question is same as http://gateoverflow.in/133771/discrete-maths-exponent-generating-function .So i am removing n! in the end to ge only an.
You mentioned t is an ,which t are you talking about?
My answer for e:) is not matching. It is given ( (-2)^n )+n! . Why is this + before n! ?.
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@Arjun Sir the problem is not with the ...