ANS:B - 21

Structure of the Pattern:

• Each number in the sequence corresponds to the position of vowels in the alphabet.
• The vowels in the English alphabet are A, E, I, O, U.

Numerical Values of Vowels:

1. A is the 1st vowel in the alphabet.
2. E is the 5th vowel in the alphabet.
3. I is the 9th vowel in the alphabet.
4. O is the 15th vowel in the alphabet.
5. U is the 21st vowel in the alphabet.

Explanation of the Pattern:

1. Identify Vowels:
   • Determine which vowels are represented in the given pattern.
2. Assign Numerical Values:
   • Each vowel corresponds to its position in the alphabet:
     • A = 1
     • E = 5
     • I = 9
     • O = 15
     • U = 21
3. Sum the Values:
   • If the pattern requires summing the values of certain vowels, add their numerical positions.

Example Walkthrough:

Suppose you are given a sequence of numbers and asked to find the total based on vowel positions. Here’s a breakdown:

• If the sequence includes the vowel U, which is the 21st vowel: Value of U=21\text{Value of U} = 21Value of U=21
• If no additional vowels are considered or the pattern only involves U, then the result is simply 21.

Conclusion:

In this pattern, each number is associated with the position of vowels in the alphabet. If the number "21" is given, it directly corresponds to the vowel U, which is the 21st vowel in the English alphabet.