10 different pairs. Since there are 5 different brands you simply add 4+3+2+1 to get 10.
Answer:

Step-by-step explanation:
The given series is

The first term is

The last term is

To find the number of terms in the sequence, solve,


The sum of the first i-terms of an arithmetic sequence is:

We substitute the values to get;



This symbol - ~ - is the "not" symbol, which means the opposite. So I think were given values for p and q? If so, you just reverse the p values to get ~p (true becomes false or 1 becomes 0 or yes becomes no).
This symbol ^ is the "and" symbol. That means that you need to figure out if both ~p and ~q are true. If so, your result is true (or 1 or yes, depending on which the problem uses). Otherwise, your result is false (or 0 or no) for each corresponding ~p and ~q value.
Answer: use this website https://www.symbolab.com/solver/polynomial-equation-calculator/%5Cleft(2x3%20%E2%88%92%203x%20%2B%2011%5Cright)%20%E2%88%92%20%5Cleft(3x2%20%2B%201%5Cright)%5Cleft(4%20%E2%88%92%208x%5Cright)