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On the probability of mathematics in the third grade of junior high school If the bulls are ahead of the pistons with three wins and two losses in the final of four wins in seven games, and the probability of the Bulls winning the pistons in each game is three fifths, then what is the probability of the pistons beating the Bulls?
Now that the Bulls win three games, the pistons will die if they lose one more
The Bulls win the pistons three fifths of a game, so the pistons win two fifths of a game
The piston needs to win four times, that is, 2 / 5 * 2 / 5 = 4 / 25, = 25 / 4, = 100 / 16, = 16%
Use the numbers 1, 2 and 3 to form a three digit number (the number can be repeated)
1) Three digit probability of exactly "1" to "2"
2) A three digit probability of at least one "3"
3) Three digit probability of three different numbers
(1)1/9
(2)7/9
(3)2/9
Four ants crawl along the edge of the square from the four positive vertices. If they have the same speed, find the probability that the four ants will not touch each other
Clockwise probability: 1 / 2 * 1 / 2 * 1 / 2 * 1 / 2 = 1 / 16, counter clockwise probability is the same, so it is 1 / 8
In an oral test, 6 questions should be randomly selected from 12 questions. If you answer 5 questions correctly, you will be excellent. If you answer 4 questions correctly, you will be qualified
(1) What is the probability that he will be excellent?
(2) What is the probability of his passing or above?
It's better to be more detailed, including the format
1、[C(8,6)+C(8,5)*C(4,1)]/C(12,6)
2、[C(8,6)+C(8,5)*C(4,1)+C(8,4)*C(4,2)]/C(12,6)
The answer is calculated by yourself ~ the expression is very clear ~ I don't know how to ask
We know that people have four blood groups a, B, O and ab. please design a simulation test scheme to estimate the probability that two of the four people have the same blood group
6*24=144
On the calculation of mathematics problems in grade three of junior high school
Rational numbers x, y, Z are not 0, and the sum of X + y + Z is 0. Let a be (y + Z) parts (absolute value of x) + (Z + x) parts (absolute value of Y) + (x + y) parts (absolute value of Z). Find the value of a ^ 2010-2a + 2010
∵ x + y + Z = 0, and XYZ ≠ 0,
X, y, Z must be one positive and two negative, or two positive and one negative,
① If x, y and Z are one positive and two negative, we can assume that x > 0, Y0 and Z
It is known that the parabola y = ax & sup2; + BX + C (a > 0) and the straight line y = K (x-1) - K & sup2 / / 4. No matter K is any real number, there is only one common point between the parabola and the straight line. Find the analytical formula of the parabola
1.9 + 19.9 + 199.9 + 0.3 solution
Divide the 0.3 into three 0.1, and then the first three with 0.1 will be OK. Add up to 222
Simple calculation of 13.45-2.19-3.81-7.45
13.45－2.19－3.81－7.45
=13.45-7.45-(2.19+3.81)
=6-6=0
How to calculate 3.14 × 81 and 3 / 7-3.14 × 6 / 7 + 19 and 3 / 7 × 3.14?
Original formula = 3.14x (81 + 3 / 7-6 / 7 + 19 + 3 / 7) = 3.14x100 = 314
Please accept
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