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PREP07 Test 1	Is the integer r divisible by 3 ? (1) r is the product of 4 consecutive positive integers.(2) r < 25
Manhattan	Is x a multiple of 4? (1) x + 2 is divisible by 2 (2) 6 is a factor of 3x
190207	1+x+$$x^{2}$$+$$x^{3}$$+$$x^{4}$$ < $$\frac{1}{1-x}$$? x≠1 1：x < 1 2：x > 0
Magoosh	If $$ W=\sqrt{\frac{1}{16}},x=(\frac{1}{100})^\frac{1}{3}and y=(\frac{1}{4})^{-2}then$$
PREP07 Test 1	If x and y are integers and $${3}^{x-4}={3}^{y+2}$$, what is y in terms of x ?
PREP07 Test 2	What is the number of different committees of 4 people that can be selected from a group of 10 people?
190215 还原机经选题: 数论&代数	$$\frac{0.0004810^{n}}{4^{2}}$$ < 210^{18}.n is an integer. What is the maximum value of n?
	If $${u}={v}^{4}$$, what is the value of $$\frac{v}{u}$$ ?1. u = 162. uv =32
PREP07 Test 2	What is the value of 3n - 4?(1) 6n – 10 = 30(2)$$\frac{n}{3} = \frac{20}{9}$$
Magoosh	If the average (arithmetic mean) of x, y, and 20 is 11, then the average of 2x + 3, 2y - 4, and 8 is
Ready4	Two sides of a triangle have lengths 4 and 6. How many different integer values of the third side are possible?
190310	What is the unit digit number of ? 1: k can be divided by 10. 2: k can be divided by 4.
190215	Two numbers are chosen from the sequence {1,2,3,4,5}. What is the probability that the product of the two numbers is less than 4?
Magoosh	If x is a positive integer ,is$$\sqrt{x}$$ an integer?(1)$$\sqrt{36x}$$ is a integer(2)$$\sqrt{3x+4}$$ is a integer
OG18-数学分册	If r, s, and t are nonzero integers, is $$r^{5}s^{3}t^{4}$$ negative ?(1) rt is negative(2) s is negative
Ready4	If $x = {(\frac{1}{64})}^{- \frac{1}{6}}$ , what is $x$ ?
Ready4	It would take one painter 5 hours to paint the rooms in a house and another painter 4 hours to paint the same rooms. How many hours would it take both painters, working simultaneously at their respective constant rates, to paint the rooms?
OG19-数学分册	If S = {0, 4, 5, 2, 11, 8), how much greater than the median of the numbers in S is the mean of the numbers in S ?
Ready4	On average, each member of Team B earned $\frac{3}{5}$ as much as each member of Team A last year. If Team B has $\frac{3}{<font color='#FE8080'>4</font>}$ as many members as Team A, what fraction of the total earnings did Team A earn?
Ready4	Is $a > b$ ? (1) $a < b^<font color='#FE8080'>4</font>$ (2) $a$ and $b$ are both negative integers