exam Maths Puzzle Numerical Ability

Using the formula for the sum of an arithmetic sequence, what is the sum of the first 20 terms?

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exam Other Question

suppose that the indes of refraction v1/v2 of light in passing from one medium into another is 1.89, and that the angle of incidence is theta1=64(degrees). using Snell's law, 3x squared + 5x + 2