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191222
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There are four objects marked 1, 2, 4, 7 in A pocket and other four objects marked 3, 5, 8, and 9 in B pocket. Let's take one object from A pocket and one from B. The probability of A >B is p, and the probability of A
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191020
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A fair coin is tossed twice，what's the probability of getting at least one head?
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OG12 PREP07 Test 2
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In the rectangular coordinate system, are the points (r,s) and (u,v) equidistant from the origin?(1)r+s=1(2)u = 1 - r and v = 1 - s
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190215
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G(n)=G(n-1)+n,G(1)=1,G(20)=?
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OG18-数学分册
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What is the value of x?(1) x + 1 = 2 - 3x(2) $$\frac{1}{2x} = 2$$
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OG19 OG20 OG2022
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Is $$\frac{x+1}{y+1}$$>$$\frac{x}{y}$$?
(1)$$0 < x < y $$
(2)$$xy > 0$$
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What is the value of x?(1)2x + 1 = 0(2)$$({x}+{1})^{2}={x}^{2}$$
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If $${x}^{2}+{y}^{2}={1}$$, is x + y = 1? (1) xy = 0 (2) y = 0
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Magoosh
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Set K consists of all fractions of the form$${ x}\over({x+2}) $$where x is a positive even integer less than 20. What is the product of all the fractions in Set K ?
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Chris mixed 3 pounds of raisins with 4 pounds of nuts. If a pound of nuts costs 3 times as much as a pound of raisins, then the total cost of the raisins was what fraction of the total cost of the mixture?
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Manhattan
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If Renee earns a raise of between 5% and 10%, non-inclusive, by what fraction could her salary have increased?
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181215
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The elements in set B are twice as many as those in set A, and the intersection of AB is empty. $$\frac{1}{3}$$of the elements in set C come from A, and $$\frac{1}{4}$$from B. What is the proportion of intersection of A and C in set C?
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PREP07 Test 1
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In the arithmetic sequence $${t}_{1}$$, $${t}_{2}$$, $${t}_{3}$$, ..., $${t}_{n}$$,..., $${t}_{1}= 23$$ and $${t}_{n} = {t}_{n-1}- 3$$ for each $$n > 1$$. What is the value of n when $${t}_{n}=-4$$ ?
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191031
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A and B are integers, 9 < A <31, 19 < B <41, a sequence is all possible values of A/B, what' s the range of A/B?
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OG18-数学分册
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If x and y are integers, what is the value of x?(1) xy = 1(2) $$x\neq - 1$$
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OG18-数学分册
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If $$rs\neq 0$$, is $$ \frac{1}{r} + \frac{1}{s} = 4$$(1) r + s = 4rs(2) r = s
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OG18-数学分册
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Is $$x^{2}$$ greater than x?(1) $$x^{2} $$is greater than 1.(2) x is greater than -1.
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OG19-数学分册
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If x and y are integers, what is the value of x?
(1) $$ xy= 1$$
(2) $$ x\neq 1$$
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OG19-数学分册
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Is $$x^{2}$$ greater than x?
(1) $$x^{2}$$ is greater than 1.
(2) x is greater than -1.
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Does the product jkmn equal 1?(1)$$\frac{jk} {mn}=1$$(2)$$j=\frac1 k$$ and $$m=\frac1 n$$
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