define onto function ?
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mathematics, a surjective function (also known as surjection, or onto function) is a function f that maps an element x to every element y; that is, for every y, there is an x such that f(x) = y. In other words, every element of the function's codomain is the image of at least one element of its domain.
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in a mobile phone assume that there are 3 persons in the contact .if every person in the contact receives a call,then the function representing making calls will be onto function
an onto function is also called a surjection
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