How many three digit numbers can be made up of 1,2,3,4,5,6,7? How to do it with permutation
A(7,3)=7*6*5=210
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- 1. Input integer m in the main function, store all prime numbers greater than 1 and less than integer m in the index group of XX Institute in function fun, and pass the number of prime numbers back to the main function. For example, input 25, then output 23571113191923; Requirements: the input of integer m and the output of prime number and prime number are completed in main function; The fun function stores all prime numbers greater than 1 and less than integer m into the index group of XX Institute, and transfers the number of prime numbers back to the main function through K;, The FUN function is called in the MAIN function.
- 2. It is proved that: - 10x2 + 7x-4 is less than 0
- 3. How many groups of 6-digit numbers can you combine with 0-9? What are these numbers?
- 4. Write a function to determine the prime number, input an integer in the main function, and output the information whether it is a prime number or not solve
- 5. It is proved that: - 10x2 + 7x-4 is less than 0
- 6. Take any 5 digits from 0 to 9 to form a 5-digit permutation In the number of 0-9, how many permutations of 5-digit car license plate
- 7. 1. Write a discriminant function of prime, in the main function input an integer, output whether it is a prime information. Urgent! Thank you!
- 8. The value of the algebraic formula - 10x + 7x-4 is always less than 0
- 9. All permutations and combinations of any six numbers from 0 to 9
- 10. Write a function to determine the prime number, input an integer in the main function, and output the information whether it is a prime number
- 11. Given that C is a real number and the opposite number of a root of equation x2-3x + C = 0 is a root of equation x2 + 3x-c = 0, find the solution of equation x2 + 3x-c = 0 and the value of C
- 12. Write function fun, the function function is to find less than or equal to Lim all prime numbers and put in the AA array, the function returns the number of prime numbers. The statements given in function fun are for reference only Ask how to do it
- 13. Use the number 123456 to form the number of four digits without repetition and the odd number is not adjacent
- 14. Given that the distance between two points a (1,63), B (0,53) and line L is equal to a, and such line l can be made into four, then the value range of a is______ .
- 15. To prove whether n is prime, we only need to judge whether n can be 2
- 16. How many odd three digit numbers are there, which are composed of the number 123456
- 17. The equation of the line with a distance of 55 from the line 2x + y + 1 = 0 is () A. 2X + y = 0b. 2x + Y-2 = 0C. 2x + y = 0 or 2x + Y-2 = 0d. 2x + y = 0 or 2x + y + 2 = 0
- 18. If a and B are not divisible by Prime n + 1, can a ^ N-B ^ n be divisible by N + 1? Can give a proof; can't give a reason,
- 19. Use 123456 six digits to form six digits without repeated digits (1) how many are adjacent to 135 (2) how many are odd digits and even digits alternating?
- 20. Let F 1 and F 2 be the left and right focal points of hyperbola x ^ 2 / 4-y ^ 2 = I respectively, and point P satisfy ∠ f 1pf 2 = 90 ° on the hyperbola, then the area of △ f 1pf 2 is