exam Maths Puzzle Numerical Ability

Express the sum 1x2 + 2x3 + 3x4 + 4x5 + ... + 10x11 in summation notation.

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exam Other Question

7x - 5 + 3x = 6 + x - 10 finf the constant term that should be added to make the following expression a perfect square trinomial

x^2-8x