The number of unordered pairs is 3.

Given:

Consider the following pairs: (2, 1) (2, 3)(1, 2)(2, 2)(3, 1)(3, 2).

To find:

The number of unordered pairs

Solution:

To determine the number of unordered pairs from the given list, It is necessary to eliminate any duplicate pairs.

The pairs (2,1) and (1,2) are the same since the order does not matter,

So (2,1) and (1,2) can count them as one pair.

Similarly, the pairs (2,3) and (3,2) are the same, and

(3,1) is the same as (1,3).

Thus, the distinct pairs are (2,1), (2,3), and (2,2).

Therefore,

The number of unordered pairs is 3.

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