{(A1, Q1)+(A2, Q2)+(A3, Q3)+ ...}

{(A1, Q1)+(A2, Q2)+(A3, Q3)+ …}

How can I describe the above whole set in ordinary English?

1. a combination of A and Q
2. a combination of A’s and Q’s
3. combinations of an A and a Q

Yutaka

(I will post again, Sorry. )

{(Q1, A1)+(Q2, A2)+(Q3, A3)+ …}

How can I describe the above whole set in ordinary English?

1. a combination of Q and A
2. a combination of Q’s and A’s
3. combinations of a Q and an A

Yutaka

I would try:

The sum of the combinations each comprised of an element from Q and an element from A.

The problem I have faced is the expression in the following sentence. A tutor advised me to use plural forms of “question” and “answer”. It is not a mathematical expression, but I could not express the problem by other ways.

“For the people who pass by, a wall should have , for example, a combination of question and reply so as not to give a strange feeling and cause misunderstandings.”

Yutaka

Besides using “question” and “answer” in plurals, perhaps also change “combination” to “pair” to make the meaning even clearer?

“For the people who pass by, a wall should have, for example, pairs of questions and replies so as not to give a strange feeling and cause misunderstandings.”

I wonder which of the three is/are right or wrong.

(1) a pair of question and answer
(2) a pair of a question and an answer
(3) a pair of questions and answers

Yutaka