Question: A particle of type X decays with equal probability either to a pair of particles of type Y or a pair of particles of

A particle of type X decays with equal probability either to a

A particle of type X decays with equal probability either to a pair of particles of type Y or a pair of particles of type Z. Both Y and Z particles are stable. The decays of two X particles are observed. A pair of Y particles is found among the decay products. What is the probability that a pair of Z particles is among these decay products? 1/4 1/3 1/2 2/3 1 A B DE [2]

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