Math

How many 3-letter combinations are possible from the first seven letters of the alphabet?

1. 👍 0
2. 👎 0
3. 👁 137
1. Permutations of 7 items taken 3 at a time.
The order matters so it is permutations, not combinations.
Look at "ordered subsets" in the link:
http://dwb4.unl.edu/Chem/CHEM869N/CHEM869NMats/Permutations.html

7! / (7-3)! = 7!/4! = 7*6*5 = 210

1. 👍 0
2. 👎 0
posted by Damon

Similar Questions

1. Statistics

Selecting a letter of the alphabet: If 3 letters of the alphabet are selected at random, find the probability of getting at least one letter "x". Letters can be used more than once. My answer was: P(at least 1 "x) = 1 - (25/26)^3

asked by Anonymous on February 21, 2014
2. English expression

A. Looking at the capital letters in Italic script carefully, trace each letter in the alphabet. There are two four lines in A, and the alphabet are written on the four line dimly.

asked by John on March 10, 2008
3. Early Childhood Education

Lesson Plan for 3 year olds: See If I am doing it correctly. Goal: To teach how to recognize the first and last letter of their names. Objective: The children will identify and name the first and last letter of their names.

asked by Barbara on March 15, 2015

Penelope created a game using a bag of 26 tiles, each with a different letter of the alphabet written on it. She uses a stopwatch to time how fast she can create one 5-letter word from a set of five randomly selected letters. To

asked by Anonymous on February 1, 2011
5. 3rd grade math hw help!

hello all, my daughter come home with a math homework "Alphabet Polygons" I have no idea how to use the letters in the alphabet to answer the questions. Please HELP! The questions are as follow: 1) You can make polygons of some of

asked by Kelly on January 31, 2011
1. language

Please help me in figuring out my worksheet that says to follow directions in the order they are given. 1.Write the word solar. 2.Add the 5th letter of the alphabet to the left of each consonant. 3.Add the 5th consonant of the

asked by nancy on October 4, 2007
2. English expression

In English alphabet, there are print type and Italic script. And each has capital letters and small letters. A. Looking at the capital alphabet in Italic script carefully, trace each alphabet. There are two four lines in A, and

asked by John on March 8, 2008
3. math

each letter of the alphabet is placed in a bag. One letter is drawn and not replaced. If three letters are drawn without replacement, what is the probability that all three letters chosen are NOT any of the five vowels, a, e, i,

asked by deklan on July 9, 2017