It is 8 representing 800
terminal-digit and Middle- digit Filing Systems
The thumb .
zero
By pooping your aself
Middle Finger.
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Well, isn't that a happy little question! To arrange numbers by their terminal digit and middle digit, you simply look at the last and middle numbers of each set and organize them accordingly. It's like painting a beautiful landscape - just take your time, be gentle with yourself, and enjoy the process of creating something unique and special.
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There are 6 solutions in all.The middle digit must be 0 , 2 or 4.If the middle digit is 0, then the first two digits must sum to 3. There are three possible solutions: 12, 21 and 30.If the middle digit is 2, then the first two digits must sum to 2. There are two possible solutions: 11 and 20.If the middle digit is 4, then the first two digits must sum to 1. There is one possible solutions: 10.
To find the three-digit numbers where the middle digit is the arithmetic mean of the other two digits, we denote a three-digit number as ( abc ), where ( a, b, c ) are its digits. The condition means ( b = \frac{a + c}{2} ), which implies ( a + c ) must be even. For ( a ) (1-9) and ( c ) (0-9), ( b ) must be an integer and a digit (0-9). The pairs ( (a, c) ) that yield valid integers for ( b ) can be counted, leading to 45 valid combinations for three-digit numbers. Thus, there are 45 such three-digit numbers where the middle digit is the arithmetic mean of the other two.
160 and 192.
100 - 109 200 - 209 300 - 309 etc. this will leave you with 10 * 9 or 90.