Decoding the Letter Cluster Pattern: PERFECT, UPDATES, UNKNOWN

This question asks us to identify a relationship between pairs of letter clusters and apply that same relationship to find the missing cluster for UNKNOWN. We need to figure out how the first cluster relates to the second, and how the third relates to the fourth, then use that logic.

Step 1: Analyzing the First Pair (PERFECT : TCEFREP)

Let's examine the transformation from PERFECT to TCEFREP.

• PERFECT has 7 letters: P, E, R, F, E, C, T.
• TCEFREP also has 7 letters: T, C, E, F, R, E, P.
• If we write the letters of PERFECT in order (1 to 7): P(1) E(2) R(3) F(4) E(5) C(6) T(7).
• Now let's look at TCEFREP: T(7) C(6) E(5) F(4) R(3) E(2) P(1).
• We can see that the letters in TCEFREP are the letters of PERFECT written in reverse order. The first letter becomes the last, the second becomes the second-to-last, and so on, until the last letter becomes the first.

Step 2: Verifying with the Second Pair (UPDATES : SETADPU)

Let's check if the same reversal pattern holds true for the second pair:

• UPDATES has 7 letters: U(1) P(2) D(3) A(4) T(5) E(6) S(7).
• Reversing the order gives us: S(7) E(6) T(5) A(4) D(3) P(2) U(1).
• This sequence spells out SETADPU.
• The reversal pattern is confirmed for the second pair.

Step 3: Applying the Pattern to UNKNOWN

Now, we apply the confirmed pattern (reversing the order of letters) to the word UNKNOWN to find the missing cluster.

• UNKNOWN has 7 letters: U(1) N(2) K(3) N(4) O(5) W(6) N(7).
• Reversing the order of these letters gives us: N(7) W(6) O(5) N(4) K(3) N(2) U(1).
• This reversed sequence spells out NWONKNU.

Step 4: Selecting the Correct Option

We need to choose the option that matches our derived cluster NWONKNU.

• Option 1: UNWNKNO
• Option 2: KNOUNWN
• Option 3: OWNUNKN
• Option 4: NWONKNU

Our calculated cluster, NWONKNU, matches Option 4.

Conclusion

The relationship between the letter clusters is simple reversal. By reversing the letters of UNKNOWN, we get NWONKNU, which is the correct answer.