Numerical Analysis/Neville's algorithm quiz

{What is the correct form of Neville's Algorithm? + $$P_{i,j}(x) = \frac{(x_{j}-x)P_{i,j-1}(x)+(x-x_{i})P_{i+1,j}(x)}{x_{j}-x_{i}}$$. - $$P_{i,j}(x) = \frac{(x_{j}+x)P_{i,j-1}(x)+(x-x_{i})P_{i+1,j}(x)}{x_{j}+x_{i}}$$. - $$P_{i,j}(x) = \frac{(x_{j}-x)P_{i,j+1}(x)+(x-x_{i})P_{i-1,j}(x)}{x_{j}-x_{i}}$$.
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{When is Neville's Algorithm most useful? - When we only want the coefficients of the polynomial. + When we only want the interpolated value of the polynomial. - When we want both the coefficients and the interpolated value of the polynomial.
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{Approximate $$\sqrt{x}$$ at $$f(6)$$ using $$x_{0}=1, x_{1}=4,$$ and $$x_{2}=9$$. + 2.071429 - 2.145654 - 2.234232
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