If pth qth rth &sth term of ap AP are in GP then show that (p-q) (q-r) (r-s) are also in GP

If pth qth rth &sth term of ap AP are in GP then show that (p-q) (q-r)

1.	If pth qth rth &sth term of ap AP are in GP then show that (p-q) (q-r) (r-s) are also in GP
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