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191020	r s t are all positive integers, and r < s < t,what is the value of r? (1)rst=6 (2)r+s+t=6
191020	Is x^2 a factor of y^2? (1)x^3 is a factor of y^3 (2)x^4 is a factor of y^4
191020	Cylinder A has a radius of 1 and a height of 4. The other cylinder B has a radius of 1.5. If two cylinders have the same volume, what is the height of B?
191020	Is n odd? (1)5n is divisible by 7 (2)3n is divisible by 5
191020	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=?
191020	A survey of 100 people watching TV programs (sports, news and others) shows that 60 people watch sports programs, 35 people watch news programs, 50 people watch other programs, 10 people watch all programs, 5 people watch neither, 4 people watch sports programs and news programs only, 10 people watch news programs and other programs only. How many people watch other programs only?
191020	How much longer is route HSW than route HTW?
191020	Is n divisible by 3? (1)n is divisible by m(m^2-1) (2)n is divisible by m^2(m-1)
191020	If $$\sqrt { x ^ { 2 } + y ^ { 2 } } = x + y$$, xy=?
191020	x is 30% more than y, and y is 40% less than z, What was the percent decrease from z to x?
191020	In the forest, 80 rabbits were caught for the first time, and then marked and put back. For the second time 80 rabbits were caught again, and we found that five of them were labeled (every rabbit in the forest has the same probability of being caught). How many rabbits are there in the forest?
191020	Is 3b+a odd? (1)b=3a+3 (2)a-b=odd
191020	$$\frac{1}{4}$$ ·$$20^8$$=?
191020	$$\frac { 1 } { 1 + 2 + 3 + 4 } + \frac { 1 } { 1 + 2 + 3 + 4 + 5 } + \ldots \ldots \frac { 1 } { 1 + 2 + 3 + \ldots + 99 } = ?$$
191020	n. k are different positive integers, and n+k<8. How many different values are there to find the product of nk?
191020	f(s)=$$\frac { 1 } { 4 } * s * t ^ { 2 }$$,and s= $$ 4^ { t }$$,so f(64)=?
191020	What is the units digit of $$2^{345} +1$$?
191020	Is 2n+1 a multiple of 3? (1)the remainder is 1 when n is divided by 3 (2)the remainder is 4 when n is divided by 6

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