3. Given that there were 4 Heads in the first 7 tosses, find the probability that the 2nd Heads occurred at the 4th toss. Give a numerical answer.______
举一反三
- Please give the correct order of talking about the weather logically. (1) give your opinion (2) give a fact (3) give a description (4)give a comparison A: (2) (3) (4) (1) B: (3) (4) (1) (2) C: (2) (4) (1) (3) D: (4) (2) (3) (1)
- There are a lot of good heads in the university.The “heads” in this sentence refers to ________.
- 【单选题】A=[3 4 5;4 2 6];B=[4 2 7];C=[A;B] 运行的结果为 A. [3 4 5 4 2 6 4 2 7] B. [3 4 4;4 2 2;5 6 7] C. [3 4 5;4 2 6;4 2 7] D. [4 2 7;3 4 5;4 2 6]
- All heads of state were _______ at the memorial ceremony. （ ） A: at a disadvantage B: in attendance C: at a time D: all at once
- Let’s put our heads together and find ______ to the puzzle. A: the way B: the method C: the solution D: the result