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How to play
The basics of playing Sudoku are very easy.No adding. No subtracting. No math.All you have to do is place the digits 1-9 throughout the grid so that each row, each column, and each 3x3 box contains each of the digits 1-9 exactly once. |
Sudoku Solution Techniques
The first things to do in tackling a Sudoku puzzle is to scan the rows and columns to see where a certain number might go, given the 3 constraints listed above. For example, the fact that a 7 is required in the top right corner can be determined by first analyzing its 9 square sub-region. The only numbers missing in the region are a 5 and a 7. However, putting a 5 in the top right box would conflict with the 5 already in the top row and the rightmost column. The 7, on the other hand, would not conflict with any of the given numbers.Once the 7 is filled in, deduction requires that only a 5 can go beneath it as all digits from 1 through 9 must be represented in the region. From there, one can turn to the two remaining open boxes in the right column - these must include a 2 and a 4 as the column's digits must represent 1 through 9. One of these options, placing the 4 beneath the 1, would lead to a conflict with the 4 already in that horizontal row, so the only option for this box must be a 2.However, options for boxes are often not that easy to deduce. Another technique is to "pencil in" possibilities and then follow the possible solutions that emerge until a conflict is found. Often these conflicts appear after 2 or 3 numbers are penciled in, and one can return to the start and try the next option until something clicks. |
Free IQ test online
An Intelligence Quotient or IQ is a score derived from one of several different standardized tests attempting to measure intelligence. Although the term "IQ" is still in common use, the scoring of modern IQ tests such as the Wechsler Adult Intelligence Scale is now based on a projection of the subject's measured rank on the Gaussian bell curve with a center value (average IQ) of 100, and a standard deviation of 15, although different tests may have different standard deviations. The average IQ scores for many populations have been rising at an average rate of three points per decade since the early 20th century with most of the increase in the lower half of the IQ range: a phenomenon called the Flynn effect. It is disputed whether these changes in scores reflect real changes in intellectual abilities, or merely methodological problems with past or present testing. (Wikipedie)
IQ test lasts approximately 30 minutes and contains 40 questions !
In the IQ test you must focus on the maximum. Test questions are simple. In the IQ test may not use the calculator and paper.
Free IQ test online :
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