DSSSB · Reasoning

Seven boxes I, J, K, L, M, N and O are placed one above the other, but not necessarily in the same order. Only three boxes are placed above K. Only one box is kept between N and K. Only three boxes are kept between N and J. J is placed at one place above K. M is placed immediately below J. I is placed at one place above O. L is not placed immediately above or below N. Which box is kept at the bottom?

  1. K
  2. O
  3. N
  4. J
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