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http://www.cr173.com/html/18295_1.html 第一种、第二种模型 分析右上角的的2，其周围的未知块a,b两块，等于其周围雷数，故可判断出a,b都是雷；接下来，分析下面的2，其周围共有3个未显示的块a,b,c，其中a,b已判断出为雷，即...
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Area of a Triangle from Sides You can calculate the area of a triangle if you know the lengths of all thr...
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The Cross Product We saw in the previous section on dot products that the dot product takes two vectors and produces a scalar, making it...
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A tank containing oil is in the shape of a downward-pointing cone with its vertical axis perpendicular to ground level. In this exercise w...
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The order statistics would be denoted where the subscript ( i ) enclosed in parentheses indicates the i th order statistic of the s...
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If the order doesn't matter, it is a Combination. If the order does matter it is a Permutation. A Permutation is an ordered Combin...
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A train is going at a speed of 60kmph towards Delhi and returned back at a speed of 30kmph. What is its average speed? Average Speed = ...
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One of the most interesting Number Patterns is Pascal's Triangle (named after Blaise Pascal , a famous French Mathematician and Philosop...
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A vector has magnitude (how long it is) and direction : Unit Vector A Unit Vector has a magnitude of 1 : The symbol is...
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To build the triangle, start with "1" at the top, then continue placing numbers below it in a triangular pattern. Each number is...
