exam Maths Puzzle Numerical Ability

A farmer intends to construct a windscreen by planting trees in a quarter mile row. His daughter points out that 44 fewer trees will be needed iff they are planted 1 foot furthe

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Find the probability that 2 friends never agree on two seperate topics out of 100. The probability that they agree on any given topic is 0.02, and ifthey did agree they would consider it a coincidence, and any two topics are independent events. log base 2 of 32=x