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Which of these correctors does the second-order Runge-Kutta method use?

Which of these correctors does the second-order Runge-Kutta method use? Correct Answer Midpoint rule corrector

The second step of the second-order Runge-Kutta method is the corrector step. For this correction, midpoint rule is used. This step makes this Runge-Kutta method a second-order method.

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In the following questions are to be based on the details given below. A salesman visits 274 houses in a town to find out the views about three products X, Y and Z. He found that 157 use X, 98 use only X, 22 use all the three, 14 use X and Z but not Y, 39 use Y and Z, 48 use only Y. How many use product Z only?
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6. Capitalisation of super profit method
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In the following figure, square represents the people who use the product of Colorbar, the triangle represents the people who use products of NYX, the circle represents people who use products of M.A.C., the rectangle represents people who use products of Maybelline and semi-circle represents the people who use the products of Lakme. Which set of letter(s) represents people who use more than one product?
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