Inverse of a matrix having same elements.

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How to find the inverse of a matrix whose all elements are same, for example suppose a 2×2 matrix whose elements are all same i.e., (say) 3,3,3,3). But we know that this matrix is singular and singular matrices do not possess inverse (this sounds contradictory), but i come to know that these types of matrices possesse inverse. If these types of matrices have inverse than how to find them ?