Solve ax=b equation where a is a tridiagonal matrix

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ramani

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matrix problem

hi to all,
i need to solve ax=b;
where a is the tridiagonal matrix.
can anyone help me to solve the above equation.
the procedure shoulde be computationally efficient and should consume lesser time for computation
 

matrix problem

hi
first give the details abt the matrix ie., dimensions of each
 

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