QuestionAugust 26, 2025

2. A pattern of letter arrangements begins with the 3 steps below. First, continue the pattern for 3 more steps: 1. A 2. ABA 3. ABCBA 4. 5. 6. How many letters are in each step above? How many letters do you think there will be in step 10?

2. A pattern of letter arrangements begins with the 3 steps below. First, continue the pattern for 3 more steps: 1. A 2. ABA 3. ABCBA 4. 5. 6. How many letters are in each step above? How many letters do you think there will be in step 10?
2. A pattern of letter arrangements begins with the 3
steps below. First, continue the pattern for 3 more
steps:
1. A
2. ABA
3. ABCBA
4.
5.
6.
How many letters are in each step above?
How many letters do you think there will be in step 10?

Solution
4.1(318 votes)

Answer

19 letters in step 10. Explanation 1. Identify the pattern Each step adds a new letter to the middle, forming a palindrome. 2. Continue the pattern for 3 more steps - Step 4: ABCDCBA - Step 5: ABCDEDCBA - Step 6: ABCDEFEDCBA 3. Count letters in each step - Step 1: 1 letter (A) - Step 2: 3 letters (ABA) - Step 3: 5 letters (ABCBA) - Step 4: 7 letters (ABCDCBA) - Step 5: 9 letters (ABCDEDCBA) - Step 6: 11 letters (ABCDEFEDCBA) 4. Determine the number of letters in step 10 The number of letters follows the sequence of odd numbers: 1, 3, 5, 7, 9, 11, etc. For step n, the number of letters is 2n - 1. Therefore, for step 10, it is 2(10) - 1 = 19.

Explanation

1. Identify the pattern<br /> Each step adds a new letter to the middle, forming a palindrome. <br /><br />2. Continue the pattern for 3 more steps<br /> <br />- Step 4: ABCDCBA<br />- Step 5: ABCDEDCBA<br />- Step 6: ABCDEFEDCBA<br /><br />3. Count letters in each step<br /> <br />- Step 1: 1 letter (A)<br />- Step 2: 3 letters (ABA)<br />- Step 3: 5 letters (ABCBA)<br />- Step 4: 7 letters (ABCDCBA)<br />- Step 5: 9 letters (ABCDEDCBA)<br />- Step 6: 11 letters (ABCDEFEDCBA)<br /><br />4. Determine the number of letters in step 10<br /> The number of letters follows the sequence of odd numbers: 1, 3, 5, 7, 9, 11, etc. For step $n$, the number of letters is $2n - 1$. Therefore, for step 10, it is $2(10) - 1 = 19$.
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