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191222
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Here is a sequence of 9 numbers, and g(n) means the value of nth term. For example, for the nine numbers: 9 8 7 6 5 4 3 2 1, then g(7)=3, so what's the value of g(g(g(4)))?
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191222
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There are 10 pairs of socks of different colors and the two socks that are in pair are the same. Take out 12 socks from the ten pairs and what is the least number of socks in pairs of these 12 socks?
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191222
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Each of the three machines works at the same constant rate. It takes k hours for two machines to produce goods. It takes 2 hours less for three machines than for two machines to produce same amount of goods. What is the value of k?
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200301
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How many diagonals does an octagon have more than a heptagon?
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200301
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(4!)^n is a factor of 12!, but (4!)^(n+1) is not a factor of 12!, what is the value of n?
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200301
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If 457*12=N, then 1 is added to which of the five numbers--4,5,7,1,2 such that difference between the new result and N is more than 2000?
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200301
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What is the maximum number of the points of intersection of a circle and a square?
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190302
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One shop sells two kinds of bowls. Each class a bowl costs $15. The price of each class B bowl is $18. Initially, there were 20 class A bowls and 18 class B bowls in this shop. A week later, the store's sales were $222. How many bowls are left in class A?
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190302
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The teacher gave 45 candies to the students in one class, and each of them received the same number of candies. The remaining sugar was 3 less than the number of students. Which one of the options can`t be the number of students in this class?
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181215
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Someone practices calligraphy. It takes him three hours to write the first page and one hour to write each page starting from the second page. His average time of writing a page is 1.25h. How many pages does he practice?
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191222 还原机经选题
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If 12! is a multiple of $$(4!)^n$$ and not a multiple of $$(4!)^{n+1}$$, what is the value of n ?
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190302 还原机经选题
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n=1234567891011121314-. n is an integer composed of positive integers arranged in order. From left to right, what is the 72nd digit of n?
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190113 还原机经选题
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1, 11, 111, 1111, 11111, -
What are the tens of the sum of the first 40 items in this series?
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还原机经选题 191222
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The "ultimate number" can be calculated in this way: add up the values of each digit until there is only one digit left. For example, 9901, 9+9+0+1= 19, 1+9= 10, 1+0=1, 1 is the "ultimate number" of 9901. How many two-digit numbers are there that have the same ultimate number as 50645?
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190124
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x comes from the set {-3,-2,-1,2,3}. How many different results can be achieved by substitute the possible value of x into the algebraic expression -|$$x^{2}$$-1|?
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190124
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m,n are prime numbers. How many factors does m$$n^{2}$$ have?
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190124
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$$\frac{1}{(2n-1)!}$$ - $$\frac{1}{(2n+1)!}$$=$$\frac{an^{2}+bn+c}{(2n+1)!}$$,a+b+c=?
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190310
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In the rectangular coordinate system, the length of AB equals to that of AC. A(0,0), B(1,3). If the coordinates of point C are all integers, then C has 8 possible positions. How many different values does BC have?
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191020
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x is 30% more than y, and y is 40% less than z, What was the percent decrease from z to x?
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191020
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If $$\frac { 1 } { ( 2 n - 1 ) ! } - \frac { 1 } { ( 2 n + 1 ) ! } = \frac { a n ^ { 2 } + b n + c } { ( 2 n + 1 ) ! }$$, so a+b+c=?
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