By examining the strangeness, we have to determine which one of the following decays or reactions proceed via the strong interaction. (a) ; (b) ; (c) ; (d) .

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The strangeness of particles involved in the decays and reactions that are being examined for its conservation are as follows:

Strangeness is added algebraically. We note that in the above list of decays and reactions only in the reactions

, and

strangeness is conserved, which is an essential condition for an interaction to take place with strong force.