exam Maths Puzzle Numerical Ability

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exam Other Question

If each pupil in a class sends a New Year card to every classmate , the total number of cards sent out will be 870 . Find number of pupils in the class ? Pls Help Multiply the fraction

2x^2 - x - 3/3x^2 + 7x + 4 (times) 3x^2 - 11x - 20/4x^2 - 9