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3. (25 pts) Count exactly the number of multiplications/divisions needed to perform forward substitution on Gy -b, where G is a nonsingular 100 x 100
3. (25 pts) Count exactly the number of multiplications/divisions needed to perform forward substitution on Gy -b, where G is a nonsingular 100 x 100 lower triangular banded matrix with semiband width 9: gij-0 for i j+ 9. You must efficiently use the banded structure and there is no need to count additions/subtractions Remember forward substitution: i-1
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