Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete? HDK 10, LIO 15, PNS 20, TSW 25, ?
XXA 30
Each cluster has three letters and a number. Analyse each position separately.
First letter: H(8), L(12), P(16), T(20) → each increases by 4. Next: T(20) + 4 = X(24).
Second letter: D(4), I(9), N(14), S(19) → each increases by 5. Next: S(19) + 5 = X(24).
Third letter: K(11), O(15), S(19), W(23) → each increases by 4. Next: W(23) + 4 = 27, which wraps to A(1) since the alphabet has 26 letters.
Number: 10, 15, 20, 25 → each increases by 5. Next: 25 + 5 = 30.
The missing cluster is XXA 30.
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How many such pairs of letters are there in the word JOURNEY (in forward direction), each of which has as many letter in the same sequence between them in the word as in the English alphabet?
