exam Maths Puzzle Numerical Ability

prove that the sequence (sn)={n/2^n} converges to zero?

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When three integers are added two at a time, three distinct sums are formed: 32, 48, and 46. What is the sum of all three of the original numbers? Explain in your own words how to factor a polynomial of the form ax^2 + bx + c when a is not equal to 1. Describe both the grouping approach as well as reversing FOIL. Contrast the