testing for a disease can be made more efficient by combining samples. If the samples from two people are combined and the mixture tests​ negative, then both samples are negative. On the other​ hand, one positive sample will always test​ positive, no matter how many negative samples it is mixed with. Assuming the probability of a single sample testing positive is 0.15​, find the probability of a positive result for two samples combined into one mixture. Is the probability low enough so that further testing of the individual samples is rarely​ necessary?w./search?q=%E2%80%8B"At+ least%E2%80%8B+one"+is+equivalent+t o%E2%80%8B+.&oq=%E2%80%8B"At+le ast%E2%80%8B+one"+is+equivalent+to% E2%80%8B+.&aqs=chrome..69i57j0i 22i30l3.409j0j4&sourceid=chrome &ie=UTF-8 The probability of a positive test result is nothing

(a)

(b) It is not too low

Step-by-step explanation:

Given

Solving (a):

First, calculate the probability of single negative

--- complement rule

The probability that two combined tests are negative is:

Using the complement rule, we have:

So, we have:

Solving (b): Is (a) low enough?

Generally, when a probability is less than or  equal to 0.05; such probabilities are extremely not likely to occur

By comparison:

Hence, it is not too low

aloha~! my name is zalgo and i am here to you out on this amazing day. to answer your question, yes, nonzero numbers can have a greatest common factor and that would be 1. still don't get it? let me considering every number is divisible by 1 and hence every number has 1 as a factor of theirs. so, if 2 nonzero numbers didn't share any gcf (greatest common factor), they would still have a factor in common and that would be 1.

i hope that this ! : p

"stay and stay proud! " - zalgo

(by the way, do you mind marking me as brainliest? i'd greatly appreciate it! mahalo! x3)