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What is the disadvantage of the Lax-Wendroff technique?

What is the disadvantage of the Lax-Wendroff technique? Correct Answer \((\frac{\partial ^2 \rho}{\partial t^2 })_{i,j}^t\)

The second order term in the Taylor series expansion of the Lax-Wendroff technique is its disadvantage. This term leads to a complex algebra while getting it using the difference schemes. The lengthy algebra here is the only considerable disadvantage of this technique.

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Which of the following statements relating to the sampling theory are correct?
1. The values of the statistical measures based on the sampled units are called values of statistics.
2. In the simple random sampling technique, the element of the population and the unit of the sample are different.
3. Snow-ball sampling technique is a probability based sampling technique.
4. The 'law of statistical regularity' and the 'law of inertia of large numbers' are the main bases of the sample to become representative of the population.
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