Computers and Technology, 10.06.2020 20:57 yuu59

Q‒1. [2×10 marks] In the questions below suppose that a “word” is any string of seven letters of the alphabet, with repeated letters allowed. a) How many words begin with R and end with T?
b)How many words begin with A or B?
c) How many words begin with A or end with B?
d)How many words begin with A or B and end with A or B?
e) How many words begin with A or B or end with A or B?
f)How many words begin with a vowel and end with a vowel?
g) How many words begin with a vowel or end with a vowel?
h)How many words begin with AAB in some order?
i)How many words have no vowels?
j)How many words have exactly one vowel?

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Answer from: gracie0818

Kindly check attached picture

Explanation:

Number of alphabets = 26

Number of vowels = 5

Number of strings in word = 7

A)How many words begin with R and end with T

First and last has been filled, positions left to fill : 7 - 2 = 5

26^5 = 11881376

B) How many words begin with A or B

First letter can begin with either A or B

Position left to fill = 7 - 1 = 6

2 options for first letter

2 × (26^6) = 617831552

C.) How many words begin with A or end with B

26^6 + 26^6 - 26^5 = 605950176

D.) How many words begin with A or B and end with A or B

Last and first positions have been filled either with A or B

Positions left to fill = 7-2 = 5

4 × (26^5) = 47525504

E) How many words begin with A or B or end with A or B?

(2 × 26^6 + 2 × 26^6 - 4 × 26^5) = 1188137600

f) How many words begin with a vowel and end with a vowel?

2^5 = 32

g) How many words begin with a vowel or end with a vowel?

(5×26^6) + (5×26^6) - (10×26^5) = 2970344000

h) How many words begin with AAB in some order?

AAB = 3 letters

Positions left to fill = 7 - 3 = 4

3 × 26^4 = 1,370,928

i) How many words have no vowels?

26 - 5 = 21 ; 21^7 = 1801088541

j) How many words have exactly one vowel

Number of words × number of vowels × (number of alphabets - number of vowels) ^ number of positions left to fill

7 × 5 × (21^6) = 3001814235

Answer from: Quest

The answer to your question is true. hope i . : )

Answer from: Quest

Yeah they want to steal your info and sell it on the dark web. they want your credit/debit card numbers, social security numbers, google passwords, and other stuff. some people install spyware onto your device, which, as the word suggests, is built to spy on your every move, such as what you type. they then sell this information to other people secretly or use it for evil purposes themselves. or both, idk. the reason why this info costs money to learn is because its valuable info. im not saying that i condone it though! hacking sucks, and whoever is involved in it is just a horrible person.

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