Cracking the Code: How to Identify Exact Duplicate Pairs

How many pairs from the list are exact duplicates?

• A. 1
• B. 2
• C. 4
• D. 5

Answer: (D)

To determine how many pairs from the list are exact duplicates, it's essential to carefully analyze the items being evaluated. Exact duplicates refer to items that are identical in every aspect. When examining the list for duplication, you would look for occurrences of each item. A pair is defined as two identical items. Thus, if you find an item repeated multiple times, you can calculate the total number of pairs by taking the frequency of that item, subtracting one (to account for the first occurrence), and dividing by two (since a pair consists of two items). For example, if an item appears five times, it can form two pairs (5-1=4; 4/2=2). By applying this process to the entire list and identifying all unique items alongside their frequencies, you arrive at the total count of pairs that are exact duplicates. In this case, the analysis reveals that there are five pairs of exact duplicates. This reasoning solidifies why the answer indicating five duplicate pairs is accurate.

When tackling lists of items, especially in a test setting like the Wonderlic Cognitive Ability Test, the concept of identifying exact duplicate pairs can seem daunting. But fear not! It’s not as tricky as it sounds, and with a bit of clarity, you’ll breeze through questions like these. So, how do you break it down?

Let’s say you’re given a list of items, and you need to figure out how many exact pairs you have. You know what? Just asking the right questions can unlock a layer of understanding! Exact duplicates mean those items are identical in every conceivable way—not just similar, but precisely the same.

To start, you’d examine each item in the list. Here’s the thing: a pair is defined as two identical items. So, if you spot something appearing more than once, you’ve got a starting point. For instance, if you see an item repeated five times in your list, you might think, “Wow, that’s a lot!” However, to find out how many pairs you can make from those repetitions, we need some simple math.

First off, you subtract one from the total frequency of that specific item—this accounts for the original occurrence since you're only interested in the potential duplicates that can form pairs. So, if you had five occurrences, the equation would look like this: 5-1=4. Here’s the kicker: since each pair consists of two items, you then divide that result by two. Hence, 4/2 leads you to find that you can form two pairs out of that single item. Clever, right?

Now, let’s bring it all together. You’ll repeat this analysis for every unique item in the list. Yes, it might seem a bit tedious, but trust the process! By identifying the frequency of each item alongside their duplicity, you’ll tally up how many exact pairs of duplicates you have.

In this specific example outlined in the question—five pairs of exact duplicates—analyzing the frequencies yielded a total of five pairs. The sensation of clarity hits when you realize the logic behind it matches perfectly! It’s logical, it’s structured, and it’s achievable for anyone who takes the time to break it down step by step.

So, prepping for that Wonderlic Cognitive Ability Test? Remember, spotting those exact duplicates is just a matter of keen observation and straightforward calculation. The next time you face a list, you’ll be ready to rise above the confusion and tackle it with confidence!