Find the length of the vector v = || 2 3 1 ||- ensure that you use at least 4 decimal place accuracy or exact values when entering your answer.

Step-by-step explanation:

The given notation is not clear enough, but I will asume that the question is: "Wich is the vector lenght of the vector in a 3 dimensional euclidean space"

Vector lenght of a vector is given by the next formula:

║║=

In this case we have a=2, b=3 and c=1. We should substitute these values in the formula given before to obtain:

║║=

Wich is the answer to the problem.  

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%