只不过有几道是很简单的英文～现在是中国时间4月16日早8点零七分.我在中午11点前需要答案～1.Twodistinctintegerswhosesumis8.总题目要求是.Determinethenumberofwaysacomputercanrandomlygenerateoneo

Question

只不过有几道是很简单的英文～
现在是中国时间 4月16日早8点零七分.我在中午 11点前需要答案～
1.Two distinct integers whose sum is 8.总题目要求是.Determine the number of ways a computercan randomly generate one or more such integers from 1 to 12.
2.
eight people are boarding an aircraft .Two have tickets for first class,and board cefore those in the economy class,In how many ways can the eight people board the aircraft
3.
nP5= 18* n-2 P 4
4.100P5 这题我用计算器没算出来= =
5.six people set in 6 passagnger car,How many ways
6.There are 50 numbers in a particular state lottery ,in how many ways can a player select six of the numbers

Answer 1

nP5 = 18* n-2 P4
nP5 = (P4-P3)* n-2 P4
(P4-P3-P5)* n= 2 P4
n= 2 P4/(P4-P3-P5)
∴ n= -8/17