E-mail fraud (phishing) is becoming an increasing problem for users of the internet. suppose that 70% of all internet users experience e-mail fraud. if 50 internet users were randomly selected, what is the probability that no more than 25 were victims of e-mail fraud?

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

s

step-by-step explanation: