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Try 151,600! Permutations & Combinations.
P(n,r)=n!(n−r)!
not
P(n,r)=n!/(n!-r!)r! ?
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How do you find the number of combinations of 6 letters?
The number of combinations of 6 letters is 6! or 720.
How many 3 digit number can be using 123?
You can make six different combinations: 123 132 213 231 321 312. If you just need to know the number of combinations, you could find the answer without writing everything out by letting x represent the number of digits and calculating x*(x-1).
You find the mean of first natural number?
The first natural number is usually taken to be 1. The mean of one number is itself so the mean of the first natural number is 1.
How many combinations of 4 numbers are there in 7 numbers?
Oh, isn't that a happy little question? Let's see here... To find the number of combinations of 4 numbers out of 7, we can use a simple formula: 7 choose 4, which is calculated as 7! / (4! * (7-4)!). So, there are 35 unique combinations of 4 numbers that can be made from a set of 7 numbers. Isn't that just delightful?
How many different arrangements of 7 letters can be formed from the letters in the word ALGEBRA?
The number of 7 letter permutations of the word ALGEBRA is the same as the number of permutation of 7 things taken 7 at a time, which is 5040. However, since the letter A is duplicated once, you have to divide by 2 in order to find out the number of distinct permutations, which is 2520.
