A light spring balance hangs

Question:

A light spring balance hangs from the hook of the other light spring balance and a block of mass M $\mathrm{kg}$ hangs from the former one. Then the true statement about the scale reading is-

  1. both the scales read M kg each

  2. the scale of the lower one reads M kg and of the upper one zero

  3. The reading of the two scales can be anything but the sum of the readings will be $\mathrm{M} \mathrm{kg}$

  4. both the scales read $\mathrm{M} / 2 \mathrm{~kg}$

Correct Option: 1

Solution:

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