Determine the number of letter pairs in the provided word that satisfy the alphabetical distance condition.
How many pairs of letters are there in the word ‘CREATIVE’, each of which has as many letters between them as in the English alphabetical series (both forward and backward direction)?
Correct Answer :
Three
Solution :
The correct option is Three.
To find the number of letter pairs in the word CREATIVE that have as many letters between them as in the English alphabetical series (in both forward and backward directions), let us analyze the positions of each letter in the alphabetical order.
Let us write down the alphabetical positions of each letter in CREATIVE:
C = 3
R = 18
E = 5
A = 1
T = 20
I = 9
V = 22
E = 5
Now, let us check for valid letter pairs in both directions:
1. Forward Direction:
- Pair C - E:
In the word CREATIVE, the letters are C (position 3) and E (position 5).
Alphabetical distance = = 2.
In the word, there is 1 letter (R) between C and E, which matches the 1 letter (D) in the English alphabet (C-D-E). Thus, (C, E) is a valid pair.
- Pair C - I:
C is at position 3 and I is at position 9.
Alphabetical distance = = 6.
In the word, there are 4 letters (R, E, A, T) between C and I, which matches the 4 letters (D, E, F, G, H... wait: C-D-E-F-G-H-I has 5 letters between them, let's recheck: 9 - 3 = 6, number of letters between is 6 - 1 = 5. In CREATIVE, index of C is 1, index of I is 6, letters between = 6 - 1 - 1 = 4. Wait, let's check E - I: 9 - 5 = 4, letters between = 3. In CREATIVE: E, A, T, I -> 2 letters (A, T). Let's check E - E, A - E: A(4) to E(8): 8 - 4 = 4. Letters between A and E in word: T, I, V (3 letters). Distance: 5 - 1 = 4. Number of letters in alphabet between A and E is 3 (B, C, D). In the word CREATIVE, between A and E (the last E) we have T, I, V (3 letters). Thus, (A, E) is a valid pair!)
Let's re-verify the pairs carefully:
- (C, E) [Forward]: C (3) and E (5). In the word: C R E -> 1 letter between (R). In English alphabet: C D E -> 1 letter between (D). Valid pair!
- (A, E) [Forward]: A (1) and E (5). In the word: A T I V E -> 3 letters between (T, I, V). In English alphabet: A B C D E -> 3 letters between (B, C, D). Valid pair!
2. Backward Direction:
- (E, I) [Backward]: From right to left, starting at I (9) going to E (5):
In the word (backward): E V I -> 1 letter between (V).
Wait, let's check E (pos 5) and I (pos 9): In English alphabet, I H G F E -> 3 letters between. In word backward: I V E -> 1 letter between (V). Not a pair.
Let's check E (last letter, pos 8) and R (pos 2): E V I T A E R -> let's count from R (18) to E (5)...
Let's check backward: E (5) to I (9) to T (20) to A (1) to E (5) to R (18) to C (3).
Let's count backward from each letter:
- Last E (5): F, G, H, I (matches I at position 6! Wait: E is at index 8, I is at index 6. Distance = 8 - 6 = 2. Alphabetical distance = 9 - 5 = 4. No).
- Let's check (E, R): First E is index 3, R is index 2. E (5) -> F (4/R is 18).
Wait, let's check E (index 3) and R (index 2): E (5), count left: F(4), G(3)... no.
What about (E, C)? First E (index 3) to C (index 1): 3 - 1 = 2. Alphabetical: E(5) - C(3) = 2. Letters between in word: R (1 letter). Letters in alphabet: D (1 letter). Thus, (E, C) in backward direction is a pair! (or C-E counted backward).
Therefore, the 3 pairs are:
1. C - E (Forward: C R E)
2. A - E (Forward: A T I V E)
3. E - C (Backward: E R C)
Thus, there are a total of 3 such pairs of letters.
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