A child psychologist prepares four-letter words to be used in a memory test. How many words can she construct if she does not repeat letters and limits her choices to the letters a, b, d, e, i, l, o, and p? how many of these words begin with the letter a? how many have vowels as the second and fourth letters?

A child psychologist prepares four-letter words to be used in a memory test. How many words can she construct if she does not repeat letters and limits her choices to the letters a, b, d, e, i, l, o, and p? how many of these words begin with the letter a? how many have vowels as the second and fourth letters?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

See similar textbooks

Similar questions

At a restaurant 48 people were asked in a survey if they eat meat, fish, or both. Of those adults 10 only eat meat, 14 only eat fish, and 17 eat both.How many people eat meat? How many do not eat meat? How many people eat fish? How many do not eat fish? How many do not eat either one?
There are 40 runners in a race. How many ways can the runners finish first, second, and third? There are different ways that the runners can finish first through third. (Type a whole number.)
You are interested in the development of language in bilinguals. You are able to locate five families in the world with 18-month-old toddlers who are learning both Swahili and Vietnamese simultaneously. Given that these are the only families that fit this qualification, therefore, these five families are your study population. You test the children to see how many words they can understand in Vietnamese. The results are listed in the following table: Toddler Number of Words in Vietnamese A 30 86 47 34 E 58 Calculate the variance 2 for this population.
Toward the end of a game of Scrabble you hold the letters D,O,G and Q. You can choose three of these four letters and arrange them in order in how many different ways?
Team Jet has 7 members who won a school competition. Of these 7, 4 members are randomly picked to receive prizes for winning. The 1st member selected wins a $50 gift card; the 2nd person selected wins a $25 gift card; the 3rd person selected wins a $10 gift card; the 4th person selected wins a $5 gift card.The names of Team Jet's members are represented by the first letter of their first names, as displayed in the following table: Name Frank Gina Harriet Inez Jakob Keven Liu Letter F G H I J K L In the box below, complete the remaining three rows of the list that models how to calculate the number of possible ways 4 team members can be selected to win the prizes.1) F G H I J K L Let Lui win the 1st prize, so select L.2) _________ _____________________________3) _________ _____________________________ 4) _________ _____________________________
There are 54 runners in a race. How many ways can the runners finish first, second, and third? There are different ways that the runners can finish first through third. (Type a whole number.) ←