Question

What starts a free-running multivibrator?

Answer 1

Nothing can start a free running multivibrator.

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Answer 2

A free-running multivibrator is started through a trigger an input signal

Explanation:

A multivibrator is an digital circuit used to implement a variety of easy -state devices which includes relaxation oscillators, timers, and flip-flops. It includes  amplifying devices (transistors, vacuum tubes, or different devices) cross-coupled through resistors or capacitors.[failed verification] The first multivibrator circuit, the astable multivibrator oscillator. They known as their circuit a "multivibrator " due to the fact its output waveform was rich in harmonics.