Abstract In the present paper, We consider the generalised form of iterative
combinations of positive linear operators with well-known Bernstein and Baskakov operators
as its particular case. We have estimated the iterative operator's $r^{th} $ moment and found
a recurrence relation between the central moments and their derivatives. We deduce the
Voronovskaya type asymptotic formula and the relation between the error of a continuous function
and its norm with restrictions on its higher derivatives.
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