math
posted by Hanna .
how many 4 number combinations can there be from 099 without repeating a number?

100 choose 4, or C(100,4) where
C(n,r) is defined as
C(n,r)=n!/[r!(nr)!]
Think of choosing the first number out of 100 choices. We can choose the next number from the remaining 99 numbers, then 98, then 97.
By the rule of multiplication of a multistep experiment, we have
100*99*98*97 possible outcomes, which correspond exactly to C(100,4).
Respond to this Question
Similar Questions

COMBINATION!!MATH!!!hurryyy!!!
Cards are drawn at random from a 52card deck. Find the number of different 5card poker hands possible consisting of 3 aces and 2 kings? 
7th grade math help please
12. Which of the following numbers is an example of an integer? 
math
what is the value of 8 in the largest even number using the nine digit number without repeating? 
math
what is the value of 8 in the largest even number using the ninedigit number without repeating? 
statistics
17. All three‐digit numbers that can be formed using the digits 1, 2, 3, 4, and 5 without repeating the digits are (a) 50. (b) 60. (c) 15. (d) 71. 18. One of the counting rules used to determine the total number of possible outcomes … 
Pre algebra
Which of these nonterminating decimals can be converted into a rational number A 0.48907542 repeating B 0.02020202 repeating C 0.92589542 repeating D 0.10203040 repeating ******* Paul is painting a square wall with an area of 115 square … 
Math
In the expression ln(3x)+ln(3+x) what is the highest possible number that x can be? 
math
How many different ways (combinations) can i arrange the 6 letters: A, B, C, D, E and F without repeating any of them. 
Math
I am the largest 6 digit odd number you can make without repeating digits. What number am I? 
Math
(_ _)*(_) = (_ _)+(_ _) = (_ _) ? Answer the formula , Using the numbers 1 to 9 without repeating each number .