What is the displacement function for one-dimensional, two noded linear elements in terms of its shape functions N1 and N2?

What is the displacement function for one-dimensional, two noded linear elements in terms of its shape functions N1 and N2? Correct Answer N1u1+N2u2

For a linear element, the displacement function is a linear polynomial of nodal displacements. A one-dimensional, two noded linear elements have two nodes with corresponding displacements u1, u2 and corresponding shape functions N1, N2. The displacement function is given by N1u1+N2u2.
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