exam Maths Puzzle Numerical Ability

the quality control inspector will reject a batch of syringes if two or more defective syringes are found in a random sample of eight syringes taken from the batch. Suppose the bat

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a jet plane travelling at a constant speeed goes 1200 mi with the wind , then turns around and travel for 1000 mi against the wind . If the speed of the wind is constant 50mph , an what is 5r^2 + 15r over (r^2)+4r+3 times (r^2)-1 over 10r simplified?