From a group of 8 people, including george and nina, 3 people are to be selected at random to work on a certain project. what is the probability that the 3 people selected will include george but not nina?

Step-by-step explanation:

We have to select george but not nina with two other people

No. of ways  selecting 2 two people knowing Geroge will be the third one is

(beacuse we have to exclude Nina)

And total no of ways of selecting 3 people out of 8 people is

Therefore the required Probability is    

=

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have