exam Maths Puzzle Numerical Ability

If there are 200 typographical error randomly distributed in a 500 page manuscript find the probability that a given page contains exactly three errors.

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exam Other Question

A car travels 400 miles on level terrain in the same amount of time it travels 160 miles on mountainous terrain. If the rate of the car is 30 miles per hour less in the mountains than on level ground, find its rate in the mountains. Solve for x: sqrt(2x-1) - sqrt(x+3) = 1