A Geiger counter and a source of radioactive particles are so situated that the probability that a

Question:

A Geiger counter and a source of radioactive particles are so situated that the probability that a particle emanating from the radioactive source will be registered by the counter is 1/10 000.
Assume that during the time of observation, 30 000 particles emanated from the source.
What is the probability that the number of particles registered was

(a) Zero,

(b) Three,

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