By Clint Brookhart
Cross determine. is a fascinating and numerous choice of maths-related anecdotes, puzzles and formulation. It exhibits readers all of the attention-grabbing issues they could determine utilizing easy algebra.'
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Extra resources for Go Figure. Using Math to Solve Everyday Imponderables
3 earthquake, which rumbled as far away as Montana. Fortunately, the Landers quake struck a relatively unpopulated area. The quake began several miles underground in the Johnson Valley Fault. Roads near Landers shifted horizontally as much as 10 feet, and dozens of aftershocks were recorded during the next 10 days. , January 17, 1994. (Is there something about the seventeenth day of the month? ) The earth’s 1Adapted from National Geographic Magazine, April 1995. Something for Everyone crust snapped miles beneath the community of Northridge, just 14 miles north of Hollywood.
And so on. Something for Everyone Example: Say you want to calculate the odds of winning a Pick 6 game of 49 numbers. Using the formula, you would get: 49! (49 Ϫ 6)! 49 ϫ 48 ϫ 47 ϫ 46 ϫ 45 ϫ 44 ϫ 43! ϭ 6 ϫ 5 ϫ 4 ϫ 3 ϫ 2 ϫ 1 ϫ 43! 49 ϫ 48 ϫ 47 ϫ 46 ϫ 45 ϫ 44 ϭ 6ϫ5ϫ4ϫ3ϫ2ϫ1 ϭ 13,983,816 nCr ϭ Thus, the odds of correctly choosing six numbers drawn from 1 through 49 is 13,983,816 to 1. Most handheld scientific calculators have the nCr capability, which simply means finding the total number of combinations of r items chosen from a total of n different items.
Patterns in Arithmetic The Ubiquitous Number Nine Mathematicians love to search for patterns and generalizations, whether in arithmetic, algebra, or geometry. Finding patterns is not only interesting, but may help you better understand mathematics as a whole. The patterns discussed here all involve the number nine. Even if some of them are familiar to you, a brief review never hurts! Casting Out Nines: Multiplication This method, generally taught in grade school, is useful for checking the results of multiplication.
Go Figure. Using Math to Solve Everyday Imponderables by Clint Brookhart