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3 years ago

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Amy and three friends launch a new website. Each of the four friends e-mails the web address to three new friends. These new fri

ends forward the web address to three more friends. If no one receives the e-mails more than once, how many people will receive the web address in the second wave of e-mails?

1 answer:

bogdanovich [222]3 years ago

4 0

4 people email 3 more people each so 12 people are emailed, then these 12 people email 3 more people each, so 36 people are emailed.

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Hello,

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Step-by-step explanation:

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Required

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There are several ways to solve this; the best is by using Venn diagram (see attachment for diagram)

Solving (a):

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From the attachment

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Solving (b):

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From the attachment

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This is calculated as:

$n(A\ n\ B)' = n(U) - n(A\ n\ B)$

$n(A\ n\ B)' = 12- 6$

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