Twenty-one persons hold different designations in a bank: CEO, MD, DGM, AGM, Manager, and Clerk. The seniority order is CEO (highest), MD, DGM, AGM, Manager, and Clerk (lowest). The number of persons at any designation is exactly one more than the number at the immediate senior designation. For example, if there are 3 AGMs, then there are 4 Managers, and so on.
Given: - P, T, and W hold the same designation. - S is senior to W. - X is senior to U, and U is not an AGM. - R and V hold the same designation. - Neither B nor H is a Manager, but both share the same designation. - D, E, and H share the same designation, which is junior to Q and T. - Q is junior to U. - The number of persons senior to Q equals the number senior to T. - X is junior to N but senior to R. - A, L, and M share the same designation. - W is not a Manager. - R is neither Manager nor Clerk. - Z and Y are senior to G and O.
Question: How many persons are senior to V?

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**Solution:**

1. The designations in descending order of seniority are: CEO > MD > DGM > AGM > Manager > Clerk.

2. The number of persons at each designation increases by one as we move down the hierarchy.

3. Since there are 21 persons in total, let the number of CEOs be *x*.

Then,
   - CEO = x
   - MD = x + 1
   - DGM = x + 2
   - AGM = x + 3
   - Manager = x + 4
   - Clerk = x + 5

4. Sum of all persons:
   $$x + (x+1) + (x+2) + (x+3) + (x+4) + (x+5) = 21$$

Simplify:
   $$6x + (1+2+3+4+5) = 21$$
   $$6x + 15 = 21$$
   $$6x = 6$$
   $$x = 1$$

5. Therefore, the number of persons at each designation is:
   - CEO = 1
   - MD = 2
   - DGM = 3
   - AGM = 4
   - Manager = 5
   - Clerk = 6

6. From the problem, R and V hold the same designation. Also, R is neither Manager nor Clerk, so R and V must be among CEO, MD, DGM, or AGM.

7. Since V is at the same level as R, and both are not Manager or Clerk, and considering the other clues, V's designation is DGM (3 persons).

8. The number of persons senior to V is the total number of persons at designations above DGM:
   - CEO (1) + MD (2) = 3 persons.

**Answer:** Three

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