Seven boxes, A, B, C, D, E, F and Y, are kept one over the other but not necessarily in the same order. Only D is kept above F. Only three boxes are kept between D and A. Only B is kept below E. Y is not kept immediately above A. How many boxes are kept between C and B?

Let the positions be from top (1) to bottom (7).

Step 1: Interpret the statements

• “Only D is kept above F” ⟶ D is immediately above F.
• “Only B is kept below E” ⟶ E is immediately above B.
• “Three boxes are kept between D and A” ⟶ positions of D and A differ by 4.
• Y is not immediately above A.

Step 2: Fix D and F

Place D at position 1 and F at position 2 (since D is immediately above F).

Then A must be 4 positions away from D:

• A at position 5.

Step 3: Place E and B

Since E must be immediately above B, the only consistent placement is:

• E at position 6
• B at position 7

Step 4: Remaining boxes

Remaining positions 3 and 4 are for C and Y.

Also, Y is not immediately above A (position 4), so:

• Position 4 = C
• Position 3 = Y

Final arrangement:

1. D
2. F
3. Y
4. C
5. A
6. E
7. B

Step 5: Count boxes between C and B

• C is at position 4
• B is at position 7

Boxes between them: positions 5 and 6 → 2 boxes

Final Answer: Two / दो