Question

verify the property (p/q*r/s=r/s*p/q) for:p/q=3/7, r/s=-4/5​

Answer 1

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A={p,q,r,s}

B={m,q,n,s,t}

C={m,n,p,q,s}

A∪(B∪C):

(B∪C)={m,n,p,q,t}

A∪(B∪C)={m,n,p,q,r,s,t}

(A∪B)∪C:

(A∪B)={m,n,p,q,r,s,t}

(A∪B)∪C={m,n,p,q,r,s,t}